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A person cannot see distinctly any object placed beyond 40 cm from his eye. Find the power of lens which will enable him to see distant stars clearly is ?

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1.5 D

-1.5 D

2.5 D

-2.5 D

answer is D.

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Detailed Solution

$V = 40 cm = 0 .4 m, u = \infty P = \frac{1}{f} = \frac{1}{v} - \frac{1}{u} \Rightarrow \frac{- 1}{0 .4} + \frac{1}{\infty} = \frac{- 1}{0 .4} = - 2 .5 D$

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