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When a ray or beam is reflected from a surface, the angle of incidence is the angle between the incident, or approaching, ray and a line perpendicular to the surface at this point.
When a ray or beam is reflected from a surface, the angle of incidence is the angle between the incident or approaching ray, and a line perpendicular to the surface at this point. By the law of reflection, this is the same angle as the angle of reflection.
By the law of reflection, this is the same angle as the angle of reflection.