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Q.

A person cannot see distinctly objects kept beyond 2 m. What would be the power of the lens required to correct this condition?


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a

0.5 D

b

-0.5 D

c

0.2 D

d

-0.2 D 

answer is B.

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Detailed Solution

A person cannot see distinctly objects kept beyond 2 m. The power of the corrective lens will be -0.5 D.
It is known that the power of the lens is given by P=1/f, where f is the focal length in m.
Let us consider the focal length as 2 m. Therefore,
P=-1/2
=> P= -0.5 D
Hence, the power of the lens will be -0.5 D.
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