A plane mirror reflecting a ray of incident light is rotated through an angle
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the normal to the surface will also tilt making an angle of θ degree with the incidence ray. and the reflecting ray will also make an angle of θ degree with the normal to the mirror (according to the law of reflection). =>the angle between the incident ray and reflected ray = 2θ degree.
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angle of reflection will be same with normal as angle of incidence with normal
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