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Reflection of Light

Two plane mir...

Question

Two plane mirrors are inclined at an angle of $30^{\circ}$ with each other as shown in the figure. A light ray, incident on one of the mirror at an angle of incidence of $60^{\circ}$ , after undergoing some reflections from the two mirror finally retraces its path and emerges out along the same line that is entered . The total number of times the ray is reflected before emerging out is

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Solution

answer: 5

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