An object is placed 20 cm from the surface of a convex

Last updated: 5/29/2023

An object is placed 20 cm from the surface of a convex mirror and a plane mirror is set so that virtual images formed by two mirrors coincide If plane mirror is at a distance of 12 cm from object then the focal length of convex mirror is 1 5 cm 2 10 cm 3 20 cm 4 40 cm