Question: Repeat Problem 24 assuming that n1 < n2 < n3.

Repeat Problem 24 assuming that n1 < n2 < n3.

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Constructive interference occurs when the rays are in phase Destructive interference occurs when they are 180 out of phase Consider phase shifts due to reflections and pathlength differences Both rays 1 and 2 are inverted For constructive interference the path length difference must be equal to an integral number of wavelengths in the film so For destructive interference the path length difference must be an odd multiple of the wavelength in the film so Ray 4 is inverted by its first reflection so the path length difference between rays 3 and 4 must be equal to an odd multiple of the wavelength in the film for constructive interference And for destructive interference 2t m 0 n 2 So when rays 1 and 2 interfere ... View full answer

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