As shown in Fig, when a ray of light is incident on a mirror, it gets reflected in accordance with the following laws of reflection:
First law: The incident ray, the reflected ray and the normal at the point of incidence all lie in the same plane.
Fig. Reflection in a plane mirror Second law: The angle of incidence (i) is equal to the angle of reflection (r) i.e.,
∠i = ∠r.
