What is called the plane of incidence of light, angle of incidence, angle of reflection?

The plane that is formed by the beam incident on the mirror and the perpendicular to the mirror surface at the point of incidence of the beam is called the plane of incidence. The angle between the incident beam and the perpendicular drawn to the plane of the mirror at the point of incidence is called the angle of incidence. The angle between the reflected beam and the perpendicular drawn to the plane of the mirror at the point of incidence is called the angle of reflection.

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