(Answered) A beam of light enters from air a 10 into three layered

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A beam of light enters from air (a =1.0) into three layered surface. Each layer has different refractive index. Trace the path of the light beam as it goes through each layer.

na = 1.00
n1 = 1.45
n2 = 1.33
n3 = 3.50

At what angle should the beam enter the surface so not refraction will be observed?

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