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Q.

Two plane mirrors are making an angle of 60° to each other. A light ray falls on one of the mirrors. The light ray is incident parallel to angular bisector of mirrors. How many reflection does the light ray undergo ?

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answer is 3.

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Detailed Solution

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On second mirror ray under goes to the normal incidence, hence light ray retraces its path at 2nd mirror.

∴Total number of reflections = 3

[2 for 1st mirror & 1 for 2nd mirror]

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