A plano convex lens fits exactly into a plano concave lens. Their plane surfaces are parallel to
Channel: Doubtnut
Date: 2021-11-02

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 refractive indices `mu_(1)` and `mu_(2)` and R is the radius curvature of the curved surface of the lenses, the focal length of the combination is