A plane mirror is plane light reflecting surface (normally glass the other surface of which is coated a thin layer of silver metal.
A ray of light is the stAraight line along which the light travels.
A ray of light which falls on a mirror is called the incident ray.
A ray of light which is sent or reflected back by the miror is called reflected ray.
Normal is a line drawn perpendicular to the surface of mirror from point the point where incident ray meets the surface of the mirror.
The angle of incidence is the angle the incident ray makes with the normal drawn at the point of incidence of the incident ray on he surface of the mirror.
The angle of reflection is the angle the reflected ray makes with the normal drawn at the point of incidence.
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