The angle at which light strikes a surface is called the angle of incidence.

Here's a breakdown:

* Angle of Incidence: The angle between the incoming light ray (the incident ray) and the normal line (an imaginary line perpendicular to the surface at the point where the light ray hits).

* Normal Line: A line that is perpendicular to the surface at the point where the light ray hits.

* Angle of Reflection: The angle between the reflected light ray and the normal line.

Important Note: The angle of incidence and the angle of reflection are equal, which is known as the Law of Reflection.