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MHT CET Physics question

PhysicsRay Optics and Optical InstrumentsMHT CET

The radii of curvature of both the surfaces of a convex lens of focal 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 respectively [MHT-CET 2020]

Answer: (B)

Solution

Originally ; after one face becomes plane , so

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Question ID VK-069513