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Question

If the reflected ray is rotated by an angle of 4θ clockwise direction then the mirror was rotated by.

A
2θ in anti-clockwise direction
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B
4θ in anti-clockwise direction
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C
2θ in clockwise direction
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D
4θ in clockwise direction
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Solution

The correct option is C 2θ in anti-clockwise direction
When a plane mirror is rotated through an angle θ, the reflected ray turns through the angle 2θ. But the size of the image remains unaffected only position changes.
Now given that the reflected ray is rotated by an angle of 4θ in the clockwise direction
It means the mirror was rotated by 4θ/2=2θ in the clockwise direction.


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