if we rotate a plane mirror by 20 then the reflected ray will rotate by
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On rotating a mirror through an angle of 20°, the reflected ray is found to get deviated through an angle Ans : 40°.
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The reflected ray always leaves at twice the angle that the mirror is rotated.
Think of it along the lines that the normal, the perpendicular line to the mirror, has rotated by 20 degrees. The incoming and departing rays are 20 degrees either side of the normal resulting in the 40 degrees total deflection.
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