MHT CET 2025 Physics question

Two thin lenses having , as the radii of curved surfaces are kept coaxially together. Their power is proportional to

(A)
(B)
(C)
(D)Correct

Answer: (D)

Solution

By the lens maker's formula the power of a thin lens is when the radii of curvature are taken as magnitudes for a biconvex lens (similarly for two thin lenses in contact, powers add: ). Therefore

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Question ID VK-102170