An isosceles prism of angle 120oC has a refractive index 1.44. Two parallel

monochromatic rays enter the prism parallel to each other in air as shown. The

rays emerge from the opposite faces

Dear Hari,

At point A, sin30^o/sinr = 1/1.44

 => r = sin^–1 (0.72) also ? BAD = 180^o – ?r

In rectange ABCD, ?A + ?B + ?C + ?D = 360^o

=> (180^o – r) + 60^o + (180^o – r) + q = 360^o

=> q = 2 [sin^–1 (0.72) – 30^o]

Best Of luck

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