Two plane mirrors M 1 & M 2 are inclined at 30º. A light ray strikes M 1 and it is parallel to M 2 . How many total reflections it will under go with both mirrors.
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Ans. 5
Sol. The ray will retrace its path after third reflection & repeat 4 th and 5 th at the place of of 2 nd & 1 st so total five reflections.
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