$A$ ray of light $XY$ is incident on a spherical mirror as shown in the diagram. Redraw the diagram and mark the normal,angle of incidence and angle of reflection.

(N/A) The incident ray $XY$,which is parallel to the principal axis,after reflection from the concave mirror will pass through the principal focus $F$.
To mark the normal,we draw a line from the center of curvature $C$ to the point of incidence $Y$.
The angle between the incident ray $XY$ and the normal $CY$ is the angle of incidence $(i)$.
The angle between the reflected ray and the normal $CY$ is the angle of reflection $(r)$.
According to the laws of reflection,the angle of incidence is equal to the angle of reflection $(i = r)$.