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MHT CET Physics question

PhysicsRay Optics and Optical InstrumentsMHT CET

A plano convex lens fits exactly into a plano-concave lens with plane surfaces parallel to each other. The radius of curvature of the curved surface of the lenses is . If the lenses are made of different materials of refractive indices and respectively, then the focal length of the combination is [MHT-CET 2023]

Answer: (A)

Solution

, so

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Question ID VK-069421