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

Question

1 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 P1 and H and R is the radius of curvature of the curved surface of the lenses then the focal length of combination is 1 3 2R H H R 2 11 11 2 4 R 2 R

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