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Q.

Figure shows a plane mirror on to which a light ray is incident. If the incident light ray is rotated by 10° and the mirror by 20°, find the angle by which the reflected ray is rotated:

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a

50cw

b

60cw

c

45cw

d

55cw

answer is A.

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Detailed Solution

Rotation in Reflected ray

10+40=50

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