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Question

What should be the angle between two plane mirrors so that whatever be the angle of incidence, the incident ray and the reflected ray from the two mirrors be parallel to each other

A
60
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B
90
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C
120
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D
175
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Solution

The correct option is B 90
Incident ray and finally reflected ray are parallel to each other means δ=180

From δ=3602θ180=3602θθ=90

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