A point source is kept on the principal axis of a convex

Last updated: 6/20/2023

A point source is kept on the principal axis of a convex lens of focal length f at a distance 4f from it Behind the lens there is a concave mirror of focal length f There are two positions of mirror such that final image coincides with the point source If the ratio of the distance between lens and mirror for the two cases is find the value 2 of n