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Two waves of light in air, of wavelength 600.0 nm, are initially in phase.
They then travel through plastic layers as shown in the figure below, with L1
= 3.85 µm, L2 = 3.35 µm, n, = 1.40, and n2 = 1.61. What multiple of A
gives their phase difference after they have both emerged from the layers?
Give absolute value.
– Lg-
R2
L1
Number
Units

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