A person can see clearly objects only when they lie between \( 50 \...

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A person can see clearly objects only when they lie between \( 50 \mathrm{~cm} \) and \( 400 \mathrm{~cm} \) from his eyes. In order
\( \mathrm{P} \) to increase the maximum distance of distinct vision

W to infinity, the type and power of the correcting lens, the person has to use, will be
(a) convex, +2.25 diopter
(b) concave, -0.25 diopter
(c) concave, -0.2 diopter
(d) convex, +0.15 diopter.
(NEET)
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