$A$ ray of light $XY$ is incident on a mirror as shown in the figure. The angle of incidence for this ray is the angle between it and the line joining two other points in the figure. Name these two points and show the course of rays after reflection.

(N/A) The angle of incidence is the angle between the incident ray and the normal at the point of incidence.
$A$ line joining the centre of curvature $(C)$ and the point of incidence $(Y)$ acts as a normal to the spherical mirror at that point.
Therefore,the two points are $C$ and $Y$.
After reflection,a ray of light incident parallel to the principal axis of a concave mirror passes through its principal focus $(F)$. The course of the reflected ray is shown in the figure.