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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. Their plane surfaces are parallel to each other. If the lenses are made of different materials of refractive indices and and is the radius of curvature of the curved surface of the lenses, then focal length of the combination is

Answer: (C)

Solution

, so ; the factor 2 in (b) and the

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Question ID VK-069397