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

Last updated: 6/13/2023

A point source is kept on the principle 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 n then find the 1 value of n