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Two plane mirrors are inclined to each other at some angle. A ray of light incident at an angle of 30 ° on one of the mirrors, after reflection from the other, retraces its path. The angle (in degree) between the mirrors

Correct answer

30

Step-by-step solution

∠ i = ∠ r = 3 0 o ∴ ∠ OIQ = 6 0 o ∴ ∠ IOQ = 9 0 o - 6 0 o = 3 0 o

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