A man cannot see clearly the objects beyond a distance of \( 20 \ma...

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A man cannot see clearly the objects beyond a distance of \( 20 \mathrm{~cm} \) from his eyes. To see distant
P objects clearly he must use which kind of lenses and

W of what focal length
(1) \( 10 \mathrm{~cm} \) convex
(2) \( 100 \mathrm{~cm} \) concave
(3) \( 20 \mathrm{~cm} \) convex
(4) \( 20 \mathrm{~cm} \) concave
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