79. If the apex angle of a prism is (f) = 72 (see Fig.
Chapter 23, Problem 79(choose chapter or problem)
79. If the apex angle of a prism is (f) = 72 (see Fig. 23-56), what is the minimum incident angle for a ray if it is to emerge from the opposite side (i.e.. not be totally internally reflected), given n = 1.50?
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