Question

Through what angle a mirror is rotated about an axis passing through the point of incidence and in the plane of mirror so that the reflected ray is rotated through an angle of `40^degree​

Answer 1

Explanation:

90 degree

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Answer 2

The mirror has to be rotated by an angle of 40° to rotate the reflected ray by 40°.

• We know from the laws of reflection that the angle of incidence and the angle of reflection are equal.
• To rotate the reflected ray by 40°, we have to rotate the incident ray by the same angle.
• If we rotate the mirror by an angle of 40° the incident ray gets rotated by the same angle with respect to the mirror.
• Hence, the reflected ray also gets rotated by 40°.