The figure below shows the path of a beam of light through severallayers with different indices of refraction.(n4 = 1.11)
(a) If θ1 =30.0°, whatis the angle θ2 of the emerging beam?

(b) What must the incident angle θ1 be inorder to have total internal reflection at the surface between themedium with n = 1.20 and the medium withn4 = 1.11?

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