Question

Xplain why a ray of light passing through C of a concave mirror gets refleted along the same path.

Answer 1

Hello,

In a spherical mirror the center of curvature 'C' is the center of the spherical surface. So any line joining the C and any point in the concave mirror is a radius of the spherical surface. Radius is always perpendicular to the spherical surface. So, any ray passing through the C is incident normally on a concave mirror. Hence, after reflection the reflected ray traces back its original path.