Ray optics

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Question

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

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Solution

The image of an object at infinity should be formed at 1m from eyes
$\begin{array}{l} \frac{1}{v} - \frac{1}{u} = \frac{1}{f} \\ \frac{1}{(- 1)} - \frac{1}{\infty} = \frac{1}{f} \\ f = - 1 m \\ P = \frac{1}{f} = - 1 D \end{array}$

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