Two Waves of Light

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Two waves of light in air, of wavelength 623.9 nm, are initially in phase. They then travel through plastic layers as shown, with L2 = 4.01um, L2= 3.59um, n1 = 1.4, and n2= 1.6. In wavelengths, what is their phase difference after they have both emerged from the layers? Do not enter units with your answer.






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