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A light ray is incident on a plane mirror at an angle of with the horizontal, then at what angle with horizontal must a plane mirror be placed in its plan so that it becomes vertically upwards after reflection

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answer is B.

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Detailed Solution

given that a light ray is incident on a plane mirror with an angle

with horizontal

Question Image

Now mirror is turned through in anticlock wise direction as show now angle of incident will be

From figure we get

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