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Question

# A light ray is incident on plane mirror at an angle 30∘ with the horizontal. At what angle with horizontal must a plane mirror be placed in its path so. that it becomes vertically upwards after reflection ?

A
300
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B
450
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C
600
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D
900
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Solution

## The correct option is A 300We know that the angle of incidence is equal to the angle of reflection. It is given that the incident ray makes an angle 30∘ with the plane and hence the reflected ray also makes an angle 30∘ with the plane. Hence the ray will be reflected in a vertical direction if the mirror is to be rotated by an angle of 60∘.∴θ=60∘The mirror should be rotated by an angle θ2=60∘2=30∘The correct answer is option (A).

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