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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 orA man can see upto 100 cm of the distant object. The power of the lens required to see far objects will be

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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=1-100−1-∞=−1100  So the power =−100100=−1D  (Distance is given in cm but P=1f in metres)
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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 orA man can see upto 100 cm of the distant object. The power of the lens required to see far objects will be