Question

. 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 infinity, the type and power of the correcting lens, the person has to use, will be A. Concave, -0.25 Diopter B. Convex, -7. 8 Diopter And why image distance(v) is taken as -400 and not -50 but he can see clear object between these two ranges.

Answer 1