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KVPY SA Exam 2018 Question Paper

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Question : 20

Total: 80

Two plane mirrors are kept on a horizontal table making an angle θ with each other as shown schematically in the figure.
The angle θ is such that any ray of light reflected after striking both the mirrors returns paralled to its incident path.
For this to happen, the value of q should be

30º
45º
60º
90º

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