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Q.

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

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a

+ 0.5 D

b

+ 1.0 D

c

+ 2.0 D

d

- 1.0 D

answer is D.

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Detailed Solution

The image of object at infinity should be formed at 100 cm from the eye1f=1∞−1100=1100So  power  =−100100=−1DDistance  is  given   in  cm  but  P=1fin  metres
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