p36_069 - 69. In this case the path traveled by ray no. 2...

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69. In this case the path traveled by ray no. 2 is longer than that of ray no. 1 by 2 L/ cos θ r , instead of 2 L . Here sin θ i / sin θ r = n 2 ,o r θ r = sin 1 (sin θ i /n 2 ). So if we replace 2 L by 2 L/ cos θ r
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