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MHT CET 2023 Physics question

PhysicsRay Optics and Optical InstrumentsMHT CET 2023

The radii of curvature of both the surfaces of a convex lens of local length 'f' and focal power 'P' are equal. One of the surfaces is made plane by grinding. The new focal length and focal power of the lens is

Answer: (D)

Solution

By the lens maker's formula, for a biconvex lens with equal radii , . When one surface is ground plane () the lens becomes plano-convex:

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Question ID VK-097849