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A person cannot see objects beyond 2.0 m clearly. If he wants to see the distant objects clearly, the power of lens required to correct his defective vision will be

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-0.5 D

2 D

-2 D

0.5 D

answer is A.

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Detailed Solution

$for an object at infinity a virtual image should form at 2 m distance .$

$\frac{1}{\infty} - \frac{1}{2} = \frac{1}{f} \Rightarrow f = - 2 m \Rightarrow P = - 0.5 D$

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