When
light bounces off an object, it either gets absorbed, or reflected. For
example, light can get absorbed on surfaces which are black in color and they
can reflect from flat surfaces such as a mirror.
It all matters on the angle of incidence. The angle of incidence is also
known as the angle of reflection.
Angle of reflection = Angle of incidence
The ray of light approaching the mirror is called the incident ray. The ray of light that leaves the mirror is called the reflected ray.
Hope it helps