The angle of incidence (the angle between the incoming ray and the normal to the surface) is always equal to the angle of reflection (the angle between the reflected ray and the normal). This is known as the law of reflection.

In other words:

* Angle of incidence = Angle of reflection

Here's a visual representation:

Imagine a ray of light hitting a mirror.

* Normal: An imaginary line perpendicular to the surface of the mirror at the point where the ray hits.

* Incident ray: The ray of light approaching the mirror.

* Reflected ray: The ray of light bouncing off the mirror.

The angle between the incident ray and the normal is the angle of incidence, and the angle between the reflected ray and the normal is the angle of reflection.