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Question

The power of lens, a short sighted person uses is −2 D. The maximum distance of an object which he can see without spectacles is

A
25 cm
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B
50 cm
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C
100 cm
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D
10 cm
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Solution

The correct option is B 50 cm
The maximum distance of an object, which a person can see without spectacles is equal to the focal length of the lens.

Hence, let focal length=f
Power=P=2 D

f=100P,
=1002cm
=50 cm
So he can see upto a distance of 50 cm, without spectacles.

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