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Two plane mirrors are inclined to each other such that a ray of light incident on the first mirror (M 1 ) and parallel to the second mirror (M 2 ) is finally reflected from the second mirror (M 2 ) parallel to the first mirror (M 1 ). The angle between the two mirrors will be :

1. 60º
2. 75º
3. 45º
4. 90º

Correct answer: 60º

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