Question: Stuck on this exercise. Please show steps and highlight answers. Thank you. The figure below shows the path of a light beam through several slabs

Stuck on this exercise. Please show steps and highlight answers. Thank you.

The figure below shows the path of a light beam through several slabs with different indices of refraction. (n4 = 1.08) u l02 114'" ' -p. (a) If 31 = 31.0, what is the angle I92 of the emerging beam? :1 (b) What must the incident angle 61 be to have total internal reflection at the surface between the medium with n = 1.20 and the medium with n4 = 1.08? :l

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