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When a light beam reflects from a plane mirror , how do you measure the angle of incidence
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When a light beam reflects from a plane mirror , how do you measure the angle of incidence

User Sandeep Chikhale
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When a light beam reflects from a plane mirror, the angle of incidence is measured as the angle between the perpendicular to the surface of the mirror (normal line)  and the incident ray (light beam) that hits the mirror.
User John Stamos
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