Question

draw a ray diagram to show the path of the reflected ray corresponding to an incident ray which is directed towards the principal focus of convex mirror . Mark on it angle of incidence and angle of reflection on it?

Answer 1

When parallel light-rays strike a convex mirror they are reflected such that they appear to emanate from a single point located behind the mirror, as shown in Fig.This point is called the virtual focus of the mirror. The focal length of the mirror is simply the distance between and .

Answer 2

The definitions of the principal axis, centre of curvature , radius of curvature , and the vertex , of a convex mirror are analogous to the corresponding definitions for a concave mirror. When parallel light-rays strike a convex mirror they are reflected such that they appear to emanate from a single point  located behind the mirror, as shown in Fig.This point is called the virtual focus of the mirror. The focal length  of the mirror is simply the distance between  and . As is easily demonstrated, in the paraxial approximation, the focal length of a convex mirror is half of its radius of curvature.