The angle between the incident ray and the normal is known as the angle of incidence. The angle between the reflected ray and the normal is known as the angle of reflection. ... The law of reflection states that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection
When a light falls on a mirror, it reflects out from the mirror. The direction in which the light falls on the mirror, the reflection goes in opposite direction. The angle in which the light strikes the mirror is called incident angle and the angle by which the reflection goes out is called reflection angle . So, according to law of reflection the angle of incident is equal to angle of reflection.
Note: Refer the image attached below.