The process of bouncing back off the light rays which fall on the surface of an object is called reflection of light.

(a) Incident ray: This is the ray of light that falls on the mirror surface.

(b) Point of incidence: This is the point at which the incident ray falls on the mirror.

(c) Normal: The line at right angle to the mirror surface at the point of incidence is called normal.

(d) Reflected ray: The ray of light which is reflected back by the mirror is called the reflected rays.

(e) Angle of incidence: The angle made by the incident ray with the normal at the point of incidence is called angle of incidence.

(f) Angle of reflection: The angle made by the reflected ray with the normal at the point of incidence is called angle of reflection.