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2015-04-01T12:44:16+05:30

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Length of each mirror = 1m = 100 cm
distance between them = 1cm

If a light ray is incident at 45⁰ on one end of 1M,
first reflection will be at the end. Then there will be one reflection at each 1cm distance. 
So in 100cm, there will be 100 reflections.

So total reflections will be 101.(one at the starting point of 1M and rest 100 in 100cm)

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