Suppose that the two waves in the figure have wavelength 635 nm in air. What multiple of A gives their phase difference when they emerge if (a) n1 1.67 and n2 = 1.77, and L = 8.81 um; (b) n1 = 1.79 and n2 1.89, and L 8.81 um; and (c) n1 = 1.76 and n2 = 1.96, andL = 3.74 um
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