Question

Why Does A Ray Of Light Passing Through The Center Of A Concave Mirror After Reflection,Is Reflected Back Along The Same Path?

Answer 1

A ray of light passing through the centre of a concave mirror is reflected back along the same path because of a simple observation. A ray of light from the centre of curvature to the surface of the mirror would act like a radius of the sphere. Since the angle of incidence of a radius is always a right angle, the light would strike the surface at perpendicular and be reflected back along the same path.