The curvature radii of a concavo-convex glass lens are `20cm`and `60cm`.th convex surface of the
Channel: Doubtnut
Date: 16/08/2020

The curvature radii of a concavo-convex glass lens are `20cm`and `60cm`.th convex surface of the lens is silvered .With the lens horizotnal ,the concave surface is filled with water.The focal length of the effective mirror is (`mu`of glass=`1.5,mu`of water=`4//3`