When a ray of light strikes a plane mirror, the light ray reflects
off the mirror. Reflection involves a change in direction of the light
ray. The convention used to express the direction of a light ray is to
indicate the angle which the light ray makes with a normal line drawn to
the surface of the mirror. The angle of incidence is the angle between
this normal line and the incident ray; the angle of reflection is the
angle between this normal line and the reflected ray. According to the
law of reflection, the angle of incidence equals the angle of
reflection. These concepts are illustrated in the animation below.
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