A man is unable to see closer than 1 m clearly.The power of lenses of his spectacles should be to see nearby object.

3 D

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6 D

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1 D

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2 D

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Solution

The correct option is D 1 D
We know that
$P = 1 / f (i n m e t e r s) w h e r e P = P o w e r f = f o c a l l e n g t h t h e r e f o r e P = 1 / 1 = 1 D$

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Similar questions

Man A has a defect of vision due to which he cannot see the nearby objects clearly (through he can see the distant objects clearly). On the other hand, man B has a defect of vision due to which he cannot see the distant objects clearly (though he can see the nearby objects clearly). The defect in man A can be corrected by using spectacles containing lenses C whereas the defect in man B can be corrected by using spectacles containing lenses D.
(a) Name the defect of vision in man (i) A and (ii) B.
(b) What type of lenses are (i) C and (ii) D?

Q. A near sighted person cannot see distinctly beyond

50 c m

from his eye. The power in diopter of spectacle lenses which will enable him to see distant objects clearly is:

Q. A person is not able to see nearby objects clearly. His vision can be corrected with the help of spectacles containing:

Q. A person finds difficulty in seeing nearby objects clearly. His vision can be corrected by using spectacles containing:
(a) converging lenses
(b) diverging lenses
(c) prismatic lenses
(d) chromatic lenses

Q. A person can see clearly up to 3 metres what should be the power of the lens in his spectacles so that he could see clearly up to 12 metres.

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A man is unable to see closer than 1 m clearly.The power of lenses of his spectacles should be to see nearby object.

The correct option is D 1 DWe know that P=1/f(inmeters)whereP=Powerf=focallengththereforeP=1/1=1D

The correct option is D 1 D
We know that
$P = 1 / f (i n m e t e r s) w h e r e P = P o w e r f = f o c a l l e n g t h t h e r e f o r e P = 1 / 1 = 1 D$