show that plane mirror makes regular reflection
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Place a strip of plane mirror in the path of the light ray . After striking the mirror, the ray of light is reflected in another direction. ... This line is known as the normal to the reflecting surface at that point . The angle between the normal and incident ray is called the angle of incidence (∠i).
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Thus, a plane mirror produces regular reflection of light. Since the angle of incidence and the angle of reflection are the same or equal, a beam of parallel rays falling on a smooth surface is reflected as a beam of parallel light rays in one direction only.
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