In figure 33-72, two light rays pass from air through five layersof transparent plastic and then back into air. The layers haveparallel interfaces and unknown thicknesses; their indexes ofrefraction are n1 = 1.4, n2= 1.8, n3 = 1.9, n4 = 1.9,and n5 = 1.6. Ray b is incident atangle θb = 26o. Relative to a normal atthe last interface, at what angle do (a) raya and (b) ray b emerge?(Hint: Solving the problem algebraically can save time.)If the air at the left and right sides in the figure were, instead,glass with index of refraction 1.5, at what angle would(c) ray a and (d) rayb emerge?

Figure 33-72

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