A plano convex lens fits exactly into a plano concave lens Their plane surfaces are parallel to each other If lenses are made of

Question

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 u and and Ris the radius of curvature of the curved surface of the lenses then the focal length of the combination is NEET 2013 a c R 2 2R 11 11 b d R R

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