A beam of light is incident upon a stack of four flat transparent materials with indices of refraction of n1 =1.8, n2 =1.5 , n3 =1.3 , and n4 =1.2, see figure.
a. If θ1 is 29o, what angle θ2 does the beam make to the normal when in emerges into the air after passing through the entire stack?
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b. What must the incident angle θ1 be to have total internal reflection at the surface between medium n4 and n?
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