A person can see clearly object only when they lie between 50cm to 400cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has

Question

Quantrex Academy · Accepted Answer

Correct answer: B. Concave, - 0 . 25D

The maximum distance of distinct vision =

400cm

. So the image of the object at infinity is to be formed at

400cm

.

Use lens formula

\dfrac{1}{v} - \dfrac{1}{u} = \dfrac{1}{f}

\dfrac{1}{- 400} - \dfrac{1}{\infty} = \dfrac{1}{f}

P = - 0.25D

A person can see clearly object only when they lie between 50cm to...

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