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Light is incident into the gap between two plane parallel mirrors and just strikes the end of one mirror as shown in the diagram

Light is incident into the gap between two plane parallel mirrors and just strikes the end of one mirror as shown in the diagram and them makes multiple reflections before leaving the gap. If d=5 cm, and tthe length of the mirrors is 100 cm, and the angle of incidence is 30 how many total reflections (from top and bottom mirror) are made before the lights exits? Number N WWW/I d

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