A person can see clearly objects only when they lie between 50 cm and 400 cm from his eyes. in order to increase the maximum distance of distinct vision to intifinty, the type and power of the correcting lens, the person has to use, will be

(a) convex +2.25 diopter

(b) concave - 0.25 dipoter

(c) concave - 0.2 dipoter

(d) convex + 0.15 dipoter

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