Blogger Widgets APEX INSTITUTE : Assignment on Optics

Tuesday, October 1, 2013

Assignment on Optics


1.             Near and far points of human eye are                                                                 [EAMCET (Med.) 1995; MP PET 2001; Bihar CECE 2004]
(a)   25 cm and infinite               (b)   50 cm and 100 cm                   (c)   25 cm and 50 cm                 (d)   0 cm and 25 cm
2.             A defective eye cannot see close objects clearly because their image is formed                                                               [MP PET 2003]
(a)   On the eye lens                                                                                (b)   Between eye lens and retina     
(c)   On the retina                                                                                    (d)   Beyond retina
3.             Retina of eye acts like ….. of camera                                                                                                                                             [AFMC 2003]
(a)   Shutter                                  (b)   Film                                            (c)   Lens                                       (d)   None of these
4.             A person who can see things most clearly at a distance of 10 cm. Requires spectacles to enable him to see clearly things at a distance of 30 cm. What should be the focal length of the spectacles                                                                                       [BHU 2003]
(a)   15 cm (concave)                   (b)   15 cm (convex)                         (c)   10 cm                                     (d)   0
6.             A person uses a lens of power + 3D to normalise vision. Near point of hypermetropic eye is                                         [CPMT 2002]
(a)   1 m                                         (b)   1.66 m                                        (c)   2 m                                         (d)   0.66 m
8.             To remove myopia (short sightedness) a lens of power 0.66 D is required. The distant point of the eye is approximately
                                                                                                                                                                                                                      [MP PMT 2001]
(a)   100 cm                                   (b)   150 cm                                       (c)   50 cm                                     (d)   25 cm
9.             A person suffering from ‘presbyopia’ should use                                                                                                                   [MP PET 2001]
(a)   A concave lens                                                                                 (b)   A convex lens                      
(c)   A bifocal lens whose lower portion is convex                          (d)   A bifocal lens whose upper portion is convex
10.         The resolving limit of healthy eye is about                                                                                   [MP PET 1999; RPMT 1999; AIIMS 2001]
(a)   1¢                                             (b)   1¢¢                                                (c)   1°                                            (d)   ¢¢
11.         A person uses spectacles of power + 2D. He is suffering from                                                                                            [MP PET 2000]
(a)   Short sightedness or myopia                                                       (b)   Long sightedness or hypermetropia
(c)   Presbyopia                                                                                       (d)   Astigmatism
12.         The hyper metropia is a                                                                                                                                                           [CBSE PMT 2000]
(a)   Short-side defect                                                                             (b)   Long-side defect
(c)   Bad vision due to old age                                                              (d)   None of these
13.         A man cannot see clearly the objects beyond a distance of 20 cm from his eyes. To see distant objects clearly he must use which kind of lenses and of what focal length                                                                                                                                    [MP PMT 2000]
(a)   100 cm convex                     (b)   100 cm concave                       (c)   20 cm convex                       (d)   20 cm concave
14.         An eye specialist prescribes spectacles having a combination of convex lens of focal length 40 cm in contact with a concave lens of focal length 25 cm. The power of this lens combination in diopters is                                              [IIT 1997 Cancelled; DPMT 2000]
(a)   + 1.5                                       (b)   –1.5                                            (c)   +6.67                                      (d)   –6.67
15.         Two parallel pillars are 11 km away from an observer. The minimum distance between the pillars so that they can be seen separately will be                                                                                                                                                          [RPET 1997; RPMT 2000]
(a)   3.2 m                                      (b)   20.8 m                                        (c)   91.5 m                                    (d)   183 m
16.         A person cannot see objects clearly beyond 2.0 m. The power of lens required to correct his vision will be
                                                                                                                                       [MP PMT/PET 1998; JIPMER 2000; KCET (Engg./Med.) 2000]
(a)   + 2.0 D                                   (b)   – 1.0 D                                        (c)   + 1.0 D                                   (d)   – 0.5 D
17.         When objects at different distances are seen by the eye, which of the following remains constant                            [MP PMT 1999]
(a)   The focal length of the eye lens                                                            (b)                                           The object distance from the eye lens
(c)   The radii of curvature of the eye lens                                          (d)   The image distance from the eye lens
18.         A person wears glasses of power –2.0 D. The defect of the eye and the far point of the person without the glasses will be
                                                                                                                                                                                                                      [MP PMT 1999]
(a)   Nearsighted, 50 cm             (b)   Farsighted, 50 cm                   (c)   Nearsighted, 250 cm          (d)   Astigmatism, 50 cm
19.         A person is suffering from the defect astigmatism. Its main reason is                                                                             [MP PMT 1997]
(a)   Distance of the eye lens from retina is increased                     (b)   Distance of the eye lens from retina is decreased
(c)   The cornea is not spherical                                                                   (d)                                           Power of accommodation of the eye is decreased
20.         Myopia is due to                                                                                                                                                                                [AFMC 1996]
(a)   Elongation of eye ball                                                                     (b)   Irregular change in focal length
(c)   Shortening of eye ball                                                                    (d)   Older age
21.         Human eye is most sensitive to visible light of the wavelength                                                                                              [CPMT 1996]
(a)   6050 Å                                   (b)   5500 Å                                       (c)   4500 Å                                   (d)   7500 Å
22.         Match the List I with the List II from the combinations shown                                                                                 [ISM Dhanbad 1994]
(I) Presbiopia                               (A) Sphero-cylindrical lens
(II) Hypermetropia                      (B) Convex lens of proper power may be used close to the eye
(III) Astigmatism                         (C) Concave lens of suitable focal length
(IV) Myopia                                  (D) Convex spectacle lens of suitable focal length
(a)   I-A; II-C; III-B; IV-D             (b)   I-B; II-D; III-C; IV-A                 (c)   I-D; II-B; III-A; IV-C             (d)   I-D; II-A; III-C; IV-B
23.         The human eye has a lens which has a                                                                                                                                      [MP PET 1994]
(a)   Soft portion at its centre                                                               (b)   Hard surface
(c)   Varying refractive index                                                                (d)   Constant refractive index
24.         A man with defective eyes cannot see distinctly object at the distance more than 60 cm from his eyes. The power of the lens to be used will be                                                                                                                                                                                    [MP PMT 1994]
(a)   + 60D                                     (b)   – 60D                                          (c)   – 1.66D                                  (d)  
25.         A person’s near point is 50 cm and his far point is 3 m. Power of the lenses he requires for
(i) Reading and                            (ii) For seeing distant stars are                                                                                          [MP PMT 1994]
(a)   – 2D and 0.33D                     (b)   2D and – 0.33D                         (c)   – 2D and 3D                          (d)   2D and – 3D
26.         The focal length of a simple convex lens used as a magnifier is 10 cm. For the image to be formed at a distance of distinct vision (D = 25 cm), the object must be placed away from the lens at a distance of                                                                               [CPMT 1991]
(a)   5 cm                                       (b)   7.14 cm                                      (c)   7.20 cm                                  (d)   16.16 cm
27.         A person is suffering from myopic defect. He is able to see clear objects placed at 15 cm. What type and of what focal length of lens he should use to see clearly the object placed 60 cm away                                                                                                   [MP PMT 1991]
(a)   Concave lens of 20 cm focal length                                             (b)   Convex lens of 20 cm focal length
(c)   Concave lens of 12 cm focal length                                             (d)   Convex lens of 12 cm focal length
28.         A person can see a thing clearly when it is at a distance of 1 metre only. If he wishes to see a distance star, he needs a lens of focal length                                                                                                                                                                                                [MP PET 1990]
(a)   +100 cm                                (b)   – 100 cm                                    (c)   +50 cm                                   (d)   –50 cm
29.         A man suffering from myopia can read a book placed at 10 cm distance. For reading the book at a distance of 60 cm with relaxed vision, focal length of the lens required will be                                                                                                                      [MP PMT 1989]
(a)   45 cm                                     (b)   – 20 cm                                      (c)   –12 cm                                   (d)   30 cm
30.         A person can see clearly objects at 100 cm distance. If he wants to see objects at 40 cm distance, then the power of the lens he shall require is                                                                                                                                                                                         [MP PET 1989]
(a)   +1.5 D                                    (b)   – 1.5 D                                        (c)   +3.0 D                                    (d)   –3.0 D
31.         If the distance of the far point for a myopia patient is doubled, the focal length of the lens required to cure it will become [MP PET 1989]
(a)   Half                                                                                                     (b)   Double                                  
(c)   The same but a convex lens                                                                   (d)                                           The same but a concave lens
32.         Image is formed for the short sighted person at                                                                                                                        [AFMC 1988]
(a)  Retina                          (b)  Before retina                    (c)  Behind the retina          (d)  Image is not formed at all
33.         A man who cannot see clearly beyond 5 m wants to see stars clearly. He should use a lens of focal length
                                                                                                                                                                                                             [MP PET/PMT 1988]
(a)   – 100 metre                           (b)   + 5 metre                                   (c)   – 5 metre                                (d)   Very large
34.         Far point of myopic eye is 250 cm, then the focal length of the lens to be used will be                                [CPMT 1986; DPMT 2002]
(a)   + 250 cm                               (b)   – 250 cm                                    (c)   + 250/9 cm                            (d)   – 250/9 cm
35.         One can take pictures of objects which are completely invisible to the eye using camera film which are invisible to [MNR 1985]
(a)   Ultra-violet rays                   (b)   Sodium light                            (c)   Visible light                          (d)   Infra-red rays
36.         In human eye the focussing is done by                                                                                                                                         [CPMT 1983]
(a)   To and fro movement of eye lens                                                 (b)   To and fro movement of the retina
(c)   Change in the convexity of the lens surface                              (d)   Change in the refractive index of the eye fluids
38.         A far sighted man who has lost his spectacles, reads a book by looking through a small hole (3-4 mm) in a sheet of paper. The reason will be                                                                                                                                                                                     [CPMT 1977]
(a)   Because the hole produces an image of the letters at a longer distance
(b)   Because in doing so, the focal length of the eye lens is effectively increased
(c)   Because in doing so, the focal length of the eye lens is effectively decreased
(d)   None of these
39.         The maximum focal length of the eye-lens of a person is greater than its distance from the retina. The eye is
(a)   Always strained in looking at an object                                     (b)   Strained for objects at large distances only
(c)   Strained for objects at short distances only                              (d)   Unstrained for all distances
40.         The focal length of a normal eye-lens is about
(a)   1 mm                                      (b)   2 cm                                           (c)   25 cm                                     (d)   1
41.         The distance of the eye-lens from the retina is x. For normal eye, the maximum focal length of the eye-lens is
(a)   = x                                          (b)   < x                                              (c)   > x                                          (d)   = 2x
42.         A man wearing glasses of focal length +1m can clearly see beyond 1m
(a)   If he is farsighted                (b)   If he is nearsighted                 (c)   If his vision is normal        (d)   In each of these cases
44.         A man, wearing glasses of power +2D can read clearly a book placed at a distance of 40 cm from the eye. The power of the lens required so that he can read at 25 cm from the eye is
(a)   +4.5 D                                    (b)   +4.0 D                                        (c)   +3.5 D                                    (d)   +3.0 D
45.         A person can see clearly between 1 m and 2m. His corrective lenses should be
(a)   Bifocals with power –0.5D and additional +3.5D                     (b)   Bifocals with power –1.0D and additional +3.0 D
(c)   Concave with power 1.0 D                                                                    (d)                                           Convex with power 0.5 D
46.         While reading the book a man keeps the page at a distance of 2.5 cm from his eye. He wants to read the book by holding the page at 25 cm. What is the nature of spectacles one should advice him to use to completely cure his eye sight
(a)   Convex lens of focal length 25 cm                                               (b)   Concave lens of focal length 25 cm
(c)   Convex lens of focal length 2.5 cm                                              (d)   Concave lens of focal length 2.5 cm
47.         The blades of a rotating fan can not be distinguished from each other due to
(a)   Parallex                                  (b)   Power of accommodation     (c)   Persistence of vision          (d)   Binocular vision
48.         Aperture of the human eye is 2 mm. Assuming the mean wavelength of light to be 5000 Å, the angular resolution limit of the eye is nearly
(a)   2 minutes                              (b)   1 minute                                    (c)   0.5 minute                             (d)   1.5 minutes
49.         If there had been one eye of the man, then
(a)   Image of the object would have been inverted                          (b)   Visible region would have decreased
(c)   Image would have not been seen three dimensional                (d)   (b) and (c) both
51.         A presbyopic patient has near point as 30 cm and far point as 40 cm. The dioptric power for the corrective lens for seeing distant objects is
(a)   40 D                                       (b)   4 D                                              (c)   2.5 D                                       (d)   0.25 D
52.         A man swimming under clear water is unable to see clearly because
(a)   The size of the aperture decreases                                              (b)   The size of the aperture increases
(c)   The focal length of eye lens increases                                         (d)   The focal length of eye lens decreases
53.         The distance between retina and eye-lens in a normal eye is 2.0 cm. The accommodated power of eye lens range from
(a)   45 D to 50 D                          (b)   50 D to 54 D                              (c)   10 D to 16 D                          (d)   5 D to 8 D
54.         If the eye is taken as a spherical ball of radius 1 cm, the range of accommodated focal length of eye-lens is
(a)   1.85 cm to 2.0 cm                (b)   1.0 cm to 2.8 cm                      (c)   1.56 cm to 2.5 cm                (d)   1.6 cm to 2.0 cm
55.         A person cannot read printed matter within 100 cm from his eye. The power of the correcting lens required to read at 20 cm from his eye if the distance between the eye lens and the correcting lens is 2 cm is
(a)   4.8 D                                       (b)   1.25 D                                        (c)   4.25 D                                    (d)   4.55 D
56.         A student having –1.5 D spectacles uses a lens of focal length 5 cm as a simple microscope to read minute scale divisions in the laboratory. The least distance of distinct vision without glasses is 20 cm for the student. The maximum magnifying power he gets with spectacles on is
a)   6                                              (b)   9                                                  (c)   5                                              (d)   4 
60.         The maximum magnification that can be obtained with a convex lens of focal length 2.5 cm is (the least distance of distinct vision is 25 cm)                                                                                                                                                                                          [MP PET 2003]
(a)   10                                           (b)   0.1                                              (c)   62.5                                        (d)   11
61.         In a compound microscope, the intermediate image is                                                               [IIT-JEE (Screening) 2000; AIEEE 2003]
(a)   Virtual, erect and magnified                                                                 (b)                                           Real, erect and magnified         
(c)   Real, inverted and magnified                                                        (d)   Virtual, erect and reduced
62.         A compound microscope has two lenses. The magnifying power of one is 5 and the combined magnifying power is 100. The magnifying power of the other lens is                                                                                                                                 [Kerala PMT 2002]
(a)   10                                           (b)   20                                               (c)   50                                           (d)   25
64.         The angular magnification of a simple microscope can be increased by increasing                                                  [Orissa JEE 2002]
(a)   Focal length of lens             (b)   Size of object                            (c)   Aperture of lens                   (d)   Power of lens
65.         The magnification produced by the objective lens and the eye lens of a compound microscope are 25 and 6 respectively. The magnifying power of this microscope is                                                                                                   [Manipal MEE 1995; DPMT 2002]
(a)   19                                           (b)   31                                               (c)   150                                         (d)   
66.         The length of the compound microscope is 14 cm. The magnifying power for relaxed eye is 25. If the focal length of eye lens is 5 cm, then the object distance for objective lens will be                                                                                                           [Pb. PMT 2002]
(a)   1.8 cm                                    (b)   1.5 cm                                        (c)   2.1 cm                                    (d)   2.4 cm
67.         The magnifying power of a simple microscope is 6. The focal length of its lens in metres will be, if least distance of distinct vision is 25 cm                                                                                                                                                                                           [MP PMT 2001]
(a)   0.05                                        (b)   0.06                                            (c)   0.25                                        (d)   0.12
68.         Relative difference of focal lengths of objective and eye lens in the microscope and telescope is given as
                                                                                                                                                                                                          [MH CET (Med.) 2001]
(a)   It is equal in both                (b)   It is more in telescope            (c)   It is more in microscope    (d)   It may be more in any one
70.         If the red light is replaced by blue light illuminating the object in a microscope the resolving power of the microscope
                                                                                                                                                                                                                             [DCE 2001]
(a)   Decreases                             (b)   Increases                                   (c)   Gets halved                           (d)   Remains unchanged
71.         In case of a simple microscope, the object is placed at                                                                                                         [UPSEAT 2000]
(a)   Focus f of the convex lens (b)   A position between f and 2f  (c)   Beyond 2f                              (d)   Between the lens and f
72.         In a compound microscope cross-wires are fixed at the point                                                                             [EAMCET (Engg.) 2000]
(a)   Where the image is formed by the objective                              (b)   Where the image is formed by the eye-piece
(c)   Where the focal point of the objective lies                                 (d)   Where the focal point of the eye-piece lies
73.         The length of the tube of a microscope is 10 cm. The focal lengths of the objective and eye lenses are 0.5 cm and 1.0 cm. The magnifying power of the microscope is about                                                                                                                       [MP PMT 2000]
(a)   5                                              (b)   23                                               (c)   166                                         (d)   500
74.         Least distance of distinct vision is 25 cm. Magnifying power of simple microscope of focal length 5 cm is
                                                                                                                                                                             [EAMCET (Engg.) 1995; Pb. PMT 1999]
(a)   1/5                                          (b)   5                                                  (c)   1/6                                          (d)   6
75.         The objective of a compound microscope is essentially                                                                                                            [SCRA 1998]
(a)   A concave lens of small focal length and small aperture          (b)   Convex lens of small focal length and large aperture
(c)   Convex lens of large focal length and large aperture               (d)   Convex lens of small focal length and small aperture
77.         A person using a lens as a simple microscope sees an                                                                                                             [AIIMS 1998]
(a)   Inverted virtual image                                                                    (b)   Inverted real magnified image 
(c)   Upright virtual image                                                                     (d)   Upright real magnified image
78.         The focal length of the objective lens of a compound microscope is                                         [CPMT 1985; MNR 1986; MP PET 1997]
(a)   Equal to the focal length of its eye piece                                    (b)   Less than the focal length of eye piece
(c)   Greater than the focal length of eye piece                                  (d)   Any of the above three
79.         To produce magnified erect image of a far object, we will be required along with a convex lens, is
                                                                                                                                                                                                   [MNR 1983; MP PAT 1996]
(a)   Another convex lens           (b)   Concave lens                            (c)   A plane mirror                     (d)   A concave mirror
80.         An object placed 10 cm in front of a lens has an image 20 cm behind the lens. What is the power of the lens (in dioptres)           
                                                                                                                                                                                                                      [MP PMT 1995]
(a)   1.5                                          (b)   3.0                                              (c)   – 15.0                                     (d)   +15.0
81.         Resolving power of a microscope depends upon                                                                                                                    [MP PET 1995]
(a)   The focal length and aperture of the eye lens                            (b)   The focal lengths of the objective and the eye lens
(c)   The apertures of the objective and the eye lens                        (d)   The wavelength of light illuminating the object
82.         If the focal length of the objective lens is increased then                                                                                                      [MP PMT 1994]
(a)   Magnifying power of microscope will increase but that of telescope will decrease
(b)   Magnifying power of microscope and telescope both will increase
(c)   Magnifying power of microscope and telescope both will decrease
(d)   Magnifying power of microscope will decrease but that of telescope will increase
84.         The magnifying power of a microscope with an objective of 5 mm focal length is 400. The length of its tube is 20 cm. Then the focal length of the eye-piece is                                                                                                                                                   [MP PMT 1991]
(a)   200 cm                                   (b)   160 cm                                       (c)   2.5 cm                                    (d)   0.1 cm
85.         In a compound microscope, if the objective produces an image Io and the eye piece produces an image Ie, then
                                                                                                                                                                                                                       [MP PET 1990]
(a)   Io is virtual but Ie is real      (b)   Io is real but Ie is virtual          (c)   Io and Ie are both real          (d)   Io and Ie are both virtual
86.         In an electron microscope if the potential is increased from 20 kV to 80 kV, the resolving power of the microscope will change from R to                                                                                                                                                                                       [CPMT 1988, 89]
(a)   R/4                                          (b)   4R                                               (c)   2R                                           (d)   R/2
87.         When the length of a microscope tube increases, its magnifying power                                                                                [MNR 1986]
(a)   Decreases                             (b)   Increases                                   (c)   Does not change                  (d)   May decrease or increase
88.         An electron microscope is superior to an optical microscope in                                                                                           [CPMT 1984]
(a)   Having better resolving power                                                     (b)   Being easy to handle          
(c)   Low cost                                                                                           (d)   Quickness of observation
89.         In a compound microscope magnification will be large, if the focal length of the eye piece is                                         [CPMT 1984]
(a)   Large                                      (b)   Smaller                                      (c)   Equal to that of objective   (d)   Less than that of objective
90.         An electron microscope gives better resolution than optical microscope because                                                            [CPMT 1982]
(a)   Electrons are abundant                                                                  (b)   Electrons can be focused nicely                                              
(c)   Effective wavelength of electron is small                                   (d)   None of these
91.         A man is looking at a small object placed at his near point. Without altering the position of his eye or the object, he puts a simple microscope of magnifying power 5X before his eyes. The angular magnification achieved is
(a)   5                                              (b)   2.5                                              (c)   1                                              (d)   0.2
93.         Find the maximum magnifying power of a compound microscope having a 25 diopter lens as the objective, a 5 diopter lens as the eyepiece and the separation 30 cm between the two lenses. The least distance for clear vision is 25 cm
(a)   8.4                                          (b)   7.4                                              (c)   9.4                                          (d)   10.4
94.         The focal length of the objective and the eye-piece of a microscope are 2 cm and 5 cm respectively and the distance between them is 30 cm. If the image seen by the eye is 25 cm from the eye-piece, the distance of the object from the objective is
(a)   0.8 cm                                    (b)   2.3 cm                                        (c)   0.4 cm                                    (d)   1.2 cm
95.         The focal length of objective and eye-piece of a microscope are 1 cm and 5 cm respectively. If the magnifying power for relaxed eye is 45, then length of the tube is
(a)   6 cm                                       (b)   9 cm                                           (c)   12 cm                                     (d)   15 cm
96.         A microscope has an objective of focal length 1.5 cm and an eye-piece of focal length 2.5 cm. If the distance between objective and eye-piece is 25 cm. What is the approximate value of magnification produced for relaxed eye is
(a)   75                                           (b)   110                                             (c)   140                                         (d)   25
97.         The magnifying power of a microscope is generally marked as 10X, 100 X, etc. These markings are for a normal relaxed eye. A microscope marked 10X is used by an old man having his near point at 40 cm. The magnifying power of the microscope for the old man with his eyes completely relaxed is
(a)   10                                           (b)   18                                               (c)   12                                           (d)   16
98.         If the focal length of objective and eye lens are 1.2 cm and 3 cm respectively and the object is put 1.25 cm away from the objective lens and the final image is formed at infinity. The magnifying power of the microscope is
(a)   150                                         (b)   200                                             (c)   250                                         (d)   400
99.         A compound microscope is adjusted for viewing the distant image of an object, the distance of the object from the object glass is now slightly increased, what re-adjustment of the instrument would be necessary for obtaining a distant image again
(a)   Objective should be moved away from the eye-piece              (b)   Eye-piece should be moved towards the objective
(c)   Both should be moved towards each other                                (d)   Both should be moved away from each other
101.      In a compound microscope, maximum magnification is obtained when the final image
(a)   Is formed at infinity                                                                        (b)   Is formed at the least of distinct vision
(c)   Coincides with the object                                                             (d)   Coincides with the objective lens


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