The angle between the incident ray and the normal is called the angle of [[1]].

The angle of incidence is the angle formed by the incident ray and the normal line.
The angle of reflection is the angle formed by the reflected ray and the normal line. 
Where normal is the perpendicular drawn to the surface of the mirror.

Therefore, the complete and correct statement would be 'The angle between the incident ray and the normal is called the angle of incidence.'