-
question_answer1)
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 done
clear
B)
Because in doing so, the focal length of the eye lens is effectively increased done
clear
C)
Because in doing so, the focal length of the eye lens is effectively decreased done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer2)
For a normal eye, the least distance of distinct vision is [CPMT 1984]
A)
0.25 m done
clear
B)
0.50 m done
clear
C)
25 m done
clear
D)
Infinite done
clear
View Solution play_arrow
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question_answer3)
For the myopic eye, the defect is cured by [CPMT 1990; KCET (Engg.) 2000]
A)
Convex lens done
clear
B)
Concave lens done
clear
C)
Cylindrical lens done
clear
D)
Toric lens done
clear
View Solution play_arrow
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question_answer4)
Lens used to remove long sightedness (hypermetropia) is or A person suffering from hypermetropia requires which type of spectacle lenses [MP PMT 1995]
A)
Concave lens done
clear
B)
Plano-concave lens done
clear
C)
Convexo-concave lens done
clear
D)
Convex lens done
clear
View Solution play_arrow
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question_answer5)
Substance on the choroid is
A)
Japan black done
clear
B)
Nigrim pigment done
clear
C)
Carbon black done
clear
D)
Platinum black done
clear
View Solution play_arrow
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question_answer6)
Astigmatism (for a human eye) can be removed by using [CPMT 1972; MP PET/PMT 1988; CBSE PMT 1990]
A)
Concave lens done
clear
B)
Convex lens done
clear
C)
Cylindrical lens done
clear
D)
Prismatic lens done
clear
View Solution play_arrow
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question_answer7)
Circular part in the centre of retina is called [MP PET/PMT 1988]
A)
Blind spot done
clear
B)
Yellow spot done
clear
C)
Red spot done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer8)
Image formed on the retina is
A)
Real and inverted done
clear
B)
Virtual and erect done
clear
C)
Real and erect done
clear
D)
Virtual and inverted done
clear
View Solution play_arrow
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question_answer9)
If there had been one eye of the man, then
A)
Image of the object would have been inverted done
clear
B)
Visible region would have decreased done
clear
C)
Image would have not been seen three dimensional done
clear
D)
(b) and (c) both done
clear
View Solution play_arrow
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question_answer10)
A person cannot see distinctly at the distance less than one metre. Calculate the power of the lens that he should use to read a book at a distance of 25 cm [CPMT 1977; MP PET 1985, 88; MP PMT 1990]
A)
+ 3.0 D done
clear
B)
+ 0.125 D done
clear
C)
? 3.0 D done
clear
D)
+ 4.0 D done
clear
View Solution play_arrow
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question_answer11)
How should people wearing spectacles work with a microscope
A)
They cannot use the microscope at all done
clear
B)
They should keep on wearing their spectacles done
clear
C)
They should take off spectacles done
clear
D)
(b) and (c) is both way done
clear
View Solution play_arrow
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question_answer12)
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; Pb. PET 2003]
A)
? 100 m done
clear
B)
+ 5 m done
clear
C)
? 5 m done
clear
D)
Very large done
clear
View Solution play_arrow
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question_answer13)
A man can see only between 75 cm and 200 cm. The power of lens to correct the near point will be
A)
+ 8/3 D done
clear
B)
+ 3 D done
clear
C)
? 3 D done
clear
D)
? 8/3 D done
clear
View Solution play_arrow
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question_answer14)
Image is formed for the short sighted person at [AFMC 1988]
A)
Retina done
clear
B)
Before retina done
clear
C)
Behind the retina done
clear
D)
Image is not formed at all done
clear
View Solution play_arrow
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question_answer15)
A man can see the objects upto a distance of one metre from his eyes. For correcting his eye sight so that he can see an object at infinity, he requires a lens whose power is or A man can see upto 100 cm of the distant object. The power of the lens required to see far objects will be [MP PMT 1993, 2003]
A)
+ 0.5 D done
clear
B)
+ 1.0 D done
clear
C)
+ 2.0 D done
clear
D)
? 1.0 D done
clear
View Solution play_arrow
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question_answer16)
A man can see the object between 15 cm and 30 cm. He uses the lens to see the far objects. Then due to the lens used, the near point will be at
A)
\[\frac{10}{3}\]cm done
clear
B)
30 cm done
clear
C)
15 cm done
clear
D)
\[\frac{100}{3}\]cm done
clear
View Solution play_arrow
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question_answer17)
The far point of a myopia eye is at 40 cm. For removing this defect, the power of lens required will be [MP PMT 1987]
A)
40 D done
clear
B)
? 4 D done
clear
C)
? 2.5 D done
clear
D)
0.25 D done
clear
View Solution play_arrow
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question_answer18)
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 done
clear
B)
? 20 cm done
clear
C)
? 12 cm done
clear
D)
30 cm done
clear
View Solution play_arrow
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question_answer19)
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 done
clear
B)
Double done
clear
C)
The same but a convex lens done
clear
D)
The same but a concave lens done
clear
View Solution play_arrow
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question_answer20)
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 done
clear
B)
4 D done
clear
C)
? 2.5 D done
clear
D)
0.25 D done
clear
View Solution play_arrow
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question_answer21)
An imaginary line joining the optical centre of the eye lens and the yellow point is called as
A)
Principal axis done
clear
B)
Vision axis done
clear
C)
Neutral axis done
clear
D)
Optical axis done
clear
View Solution play_arrow
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question_answer22)
The light when enters the human eye experiences most of the refraction while passing through
A)
Cornea done
clear
B)
Aqueous humour done
clear
C)
Vitrous humour done
clear
D)
Crystalline lens done
clear
View Solution play_arrow
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question_answer23)
The impact of an image on the retina remains for
A)
0.1 sec done
clear
B)
0.5 sec done
clear
C)
10 sec done
clear
D)
15 sec done
clear
View Solution play_arrow
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question_answer24)
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 done
clear
B)
Convex lens of 20 cm focal length done
clear
C)
Concave lens of 12 cm focal length done
clear
D)
Convex lens of 12 cm focal length done
clear
View Solution play_arrow
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question_answer25)
The sensation of vision in the retina is carried to the brain by
A)
Ciliary muscles done
clear
B)
Blind spot done
clear
C)
Cylindrical lens done
clear
D)
Optic nerve done
clear
View Solution play_arrow
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question_answer26)
When the power of eye lens increases, the defect of vision is produced. The defect is known as
A)
Shortsightedness done
clear
B)
Longsightedness done
clear
C)
Colourblindness done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer27)
A man is suffering from colour blindness for green colour. To remove this defect, he should use goggles of
A)
Green colour glasses done
clear
B)
Red colour glasses done
clear
C)
Smoky colour glasses done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer28)
In human eye the focussing is done by [CPMT 1983]
A)
To and fro movement of eye lens done
clear
B)
To and fro movement of the retina done
clear
C)
Change in the convexity of the lens surface done
clear
D)
Change in the refractive index of the eye fluids done
clear
View Solution play_arrow
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question_answer29)
A short sighted person can see distinctly only those objects which lie between 10 cm and 100 cm from him. The power of the spectacle lens required to see a distant object is [MP PET 1992]
A)
+ 0.5 D done
clear
B)
? 1.0 D done
clear
C)
? 10 D done
clear
D)
+ 4.0 D done
clear
View Solution play_arrow
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question_answer30)
A person can see clearly only upto a distance of 25 cm. He wants to read a book placed at a distance of 50 cm. What kind of lens does he require for his spectacles and what must be its power [MP PMT 1992]
A)
Concave, ? 1.0 D done
clear
B)
Convex, + 1.5 D done
clear
C)
Concave, ? 2.0 D done
clear
D)
Convex, + 2.0 D done
clear
View Solution play_arrow
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question_answer31)
The human eye has a lens which has a [MP PET 1994]
A)
Soft portion at its centre done
clear
B)
Hard surface done
clear
C)
Varying refractive index done
clear
D)
Constant refractive index done
clear
View Solution play_arrow
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question_answer32)
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)
+ 60 D done
clear
B)
? 60 D done
clear
C)
? 1.66 D done
clear
D)
\[\frac{1}{1.66}D\] done
clear
View Solution play_arrow
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question_answer33)
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)
? 2 D and 0.33 D done
clear
B)
2 D and ? 0.33 D done
clear
C)
? 2 D and 3 D done
clear
D)
2 D and ? 3 D done
clear
View Solution play_arrow
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question_answer34)
A person wears glasses of power ? 2.5 D. The defect of the eye and the far point of the person without the glasses are respectively [MP PET 1995]
A)
Farsightedness, 40 cm done
clear
B)
Nearsightedness, 40 cm done
clear
C)
Astigmatism, 40 cm done
clear
D)
Nearsightedness, 250 cm done
clear
View Solution play_arrow
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question_answer35)
Myopia is due to [AFMC 1996]
A)
Elongation of eye ball done
clear
B)
Irregular change in focal length done
clear
C)
Shortening of eye ball done
clear
D)
Older age done
clear
View Solution play_arrow
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question_answer36)
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 done
clear
B)
Distance of the eye lens from retina is decreased done
clear
C)
The cornea is not spherical done
clear
D)
Power of accommodation of the eye is decreased done
clear
View Solution play_arrow
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question_answer37)
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 2000; Pb. PET 2001]
A)
+ 2.0 D done
clear
B)
? 1.0 D done
clear
C)
+ 1.0 D done
clear
D)
? 0.5 D done
clear
View Solution play_arrow
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question_answer38)
The resolving limit of healthy eye is about [MP PET 1999; RPMT 1999; AIIMS 2001]
A)
\[{1}'\] or \[{{\left( \frac{1}{60} \right)}^{{}^\circ }}\] done
clear
B)
\[{1}''\] done
clear
C)
\[{{1}^{o}}\] done
clear
D)
\[\frac{1}{60}''\] done
clear
View Solution play_arrow
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question_answer39)
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 done
clear
B)
The object distance from the eye lens done
clear
C)
The radii of curvature of the eye lens done
clear
D)
The image distance from the eye lens done
clear
View Solution play_arrow
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question_answer40)
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 done
clear
B)
Farsighted, 50 cm done
clear
C)
Nearsighted, 250 cm done
clear
D)
Astigmatism, 50 cm done
clear
View Solution play_arrow
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question_answer41)
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 done
clear
B)
? 1.5 done
clear
C)
+ 6.67 done
clear
D)
? 6.67 done
clear
View Solution play_arrow
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question_answer42)
Match the List I with the List II from the combinations shown [ISM Dhanbad 1994]
(I) | Presbiopia | | Sphero-cylindrical lens |
(II) | Hypermetropia | | Convex lens of proper power may be used close to the eye |
(III) | Astigmatism | | Concave lens of suitable focal length |
(IV) | Myopia | | Bifocal lens of suitable focal length |
A)
I-A; II-C; III-B; IV-D done
clear
B)
I-B; II-D; III-C; IV-A done
clear
C)
I-D; II-B; III-A; IV-C done
clear
D)
I-D; II-A; III-C; IV-B done
clear
View Solution play_arrow
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question_answer43)
Near and far points of a human eye are [EAMCET (Med.) 1995; MP PET 2001; BCECE 2004]
A)
0 and 25 cm done
clear
B)
0 and ¥ done
clear
C)
25 cm and 100 cm done
clear
D)
25 cm and ¥ done
clear
View Solution play_arrow
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question_answer44)
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 done
clear
B)
20.8 m done
clear
C)
91.5 m done
clear
D)
183 m done
clear
View Solution play_arrow
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question_answer45)
Retina of eye acts like........ of camera [AFMC 2003]
A)
Shutter done
clear
B)
Film done
clear
C)
Lens done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer46)
The hyper-metropia is a [CBSE PMT 2000]
A)
Short-side defect done
clear
B)
Long- side defect done
clear
C)
Bad vision due to old age done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer47)
Amount of light entering into the camera depends upon [DCE 2000]
A)
Focal length of the objective lens done
clear
B)
Product of focal length and diameter of the objective lens done
clear
C)
Distance of the object from camera done
clear
D)
Aperture setting of the camera done
clear
View Solution play_arrow
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question_answer48)
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 done
clear
B)
100 cm concave done
clear
C)
20 cm convex done
clear
D)
20 cm concave done
clear
View Solution play_arrow
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question_answer49)
A person uses spectacles of power +2D. He is suffering from [MP PET 2000]
A)
Short sightedness or myopia done
clear
B)
Long sightedness or hypermetropia done
clear
C)
Presbyopia done
clear
D)
Astigmatism done
clear
View Solution play_arrow
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question_answer50)
To remove myopia (short sightedness) a lens of power 0.66 D is required. The distant point of the eye is approximately v[MP PMT 2001]
A)
100 cm done
clear
B)
150 cm done
clear
C)
50 cm done
clear
D)
25 cm done
clear
View Solution play_arrow
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question_answer51)
A person suffering from 'presbyopia' (myopia and hyper metropia both defects) should use [MP PET 2001]
A)
A concave lens done
clear
B)
A convex lens done
clear
C)
A bifocal lens whose lower portion is convex done
clear
D)
A bifocal lens whose upper portion is convex done
clear
View Solution play_arrow
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question_answer52)
A person who can see things most clearly at a distance of 10 cm. Requires spectacles to enable to him to see clearly things at a distance of 30 cm. What should be the focal length of the spectacles [BHU 2003; CPMT 2004; PM PMT 2005]
A)
15 cm (Concave) done
clear
B)
15 cm (Convex) done
clear
C)
10 cm done
clear
D)
0 done
clear
View Solution play_arrow
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question_answer53)
Far points of myopic eye is 250 cm, then the focal length of the lens to be used will be [DPMT 2002]
A)
? 250 cm done
clear
B)
? 250/9 cm done
clear
C)
+ 250 cm done
clear
D)
+ 250/9 cm done
clear
View Solution play_arrow
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question_answer54)
A man can see clearly up to 3 metres. Prescribe a lens for his spectacles so that he can see clearly up to 12 metres [DPMT 2002]
A)
? 3/4 D done
clear
B)
3 D done
clear
C)
? 1/4 D done
clear
D)
? 4 D done
clear
View Solution play_arrow
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question_answer55)
A satisfactory photographic print is obtained when the exposure time is 10 sec at a distance of 2 m from a 60 cd lamp. The time of exposure required for the same quality print at a distance of 4 m from a 120 cd lamp is [Kerala PMT 2002]
A)
5 sec done
clear
B)
10 sec done
clear
C)
15 sec done
clear
D)
20 sec done
clear
View Solution play_arrow
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question_answer56)
A person cannot see the objects clearly placed at a distance more than 40 cm. He is advised to use a lens of power [DCE 2002; MP PMT 2002, 03]
A)
? 2.5 D done
clear
B)
+ 2.5 D done
clear
C)
? 6.25 D done
clear
D)
+ 1.5 D done
clear
View Solution play_arrow
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question_answer57)
A person uses a lens of power + 3D to normalise vision. Near point of hypermetropic eye is [CPMT 2002]
A)
1 m done
clear
B)
1.66 m done
clear
C)
2 m done
clear
D)
0.66 m done
clear
View Solution play_arrow
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question_answer58)
A defective eye cannot see close objects clearly because their image is formed [MP PET 2003]
A)
On the eye lens done
clear
B)
Between eye lens and retina done
clear
C)
On the retina done
clear
D)
Beyond retina done
clear
View Solution play_arrow
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question_answer59)
Image formed on retina of eye is proportional to [RPMT 2001]
A)
Size of object done
clear
B)
Area of object done
clear
C)
\[\frac{Size\ of\ object}{Size\ of\ image}\] done
clear
D)
\[\frac{size\ of\ image}{size\ of\ object}\] done
clear
View Solution play_arrow
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question_answer60)
A student can distinctly see the object upto a distance 15 cm. He wants to see the black board at a distance of 3 m. Focal length and power of lens used respectively will be [Pb. PMT 2003]
A)
\[-\,4.8\,cm,\ -\,3.3\,D\] done
clear
B)
\[-\,5.8\,cm,\ -\,4.3\,D\] done
clear
C)
\[-\,7.5\,cm,\ -\,6.3\,D\] done
clear
D)
\[-\,15.8\,cm,\ -\,6.3\,D\] done
clear
View Solution play_arrow
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question_answer61)
A camera objective has an aperture diameter d. If the aperture is reduced to diameter \[d/2,\] the exposure time under identical conditions of light should be made [Kerala PMT 2004]
A)
\[\sqrt{2}\]fold done
clear
B)
2 fold done
clear
C)
\[2\sqrt{2}\]fold done
clear
D)
4 fold done
clear
View Solution play_arrow
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question_answer62)
The light gathering power of a camera lens depends on [DCE 2003]
A)
Its diameter only done
clear
B)
Ratio of focal length and diameter done
clear
C)
Product of focal length and diameter done
clear
D)
Wavelength of light used done
clear
View Solution play_arrow
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question_answer63)
The exposure time of a camera lens at the \[\frac{f}{2.8}\] setting is \[\frac{1}{200}\] second. The correct time of exposure at \[\frac{f}{5.6}\] is [DCE 2003]
A)
0.4 sec done
clear
B)
0.02 sec done
clear
C)
0.002 sec done
clear
D)
0.04 sec done
clear
View Solution play_arrow
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question_answer64)
Ability of the eye to see objects at all distances is called [AFMC 2005]
A)
Binocular vision done
clear
B)
Myopia done
clear
C)
Hypermetropia done
clear
D)
Accommodation done
clear
View Solution play_arrow
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question_answer65)
Identify the wrong description of the above figures [KCET 2005]
A)
1 represents far-sightedness done
clear
B)
2 correction for short sightedness done
clear
C)
3 represents far sightedness done
clear
D)
4 correction for far-sightedness done
clear
View Solution play_arrow