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NEET 2013 Physics question

PhysicsRay Optics and Optical InstrumentsNEET 2013

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

Answer: (3)

Solution

Using the lens maker's formula . Plano-convex lens (index , curved surface of radius facing the concave lens): . Plano-concave lens (index

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Question ID VK-091333