A plano-convex lens when silvered on the plane side behaves line a concave mirror of focal length
Channel: Doubtnut
Date: 2021-11-02

A plano-convex lens when silvered on the plane side behaves line a concave mirror of focal length 60 cm. However when silvered on the convex side it behaves like a concave mirror of focal length 20 cm. Then the refractive index of the lens