Draw the reflected ray corresponding to the ray incident on a concave mirror as shown in the ray diagram?

A ray of light passing parallel to the principal axis always passes through the principal focus after being reflected.

NOTE: ‘i’ is the angle of incidence. ‘r’ is the angle of reflection. Center of curvature is the center of the sphere of which the spherical mirror is a part. Principal axis is an imaginary line passing through the pole and the center of curvature of a spherical mirror. Pole is the midpoint of a spherical mirror. Principal focus or focus is a point on the principal axis, where a beam of light, parallel to the principal axis, after reflection, either actually meets (concave) or appears to meet (convex).