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32_Ch 24 College Physics ProblemCH24 Wave Optics

# 32_Ch 24 College Physics ProblemCH24 Wave Optics - 334...

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334 CHAPTER 24 24.68 Phase reversals occur in the reflections at both surfaces of the oil layer, so there is zero net phase difference due to reflections. The condition for constructive interference is then 2 bright n film t m m n λ λ = = (1) and the condition for destructive interference is 1 1 2 2 2 dark n film t m m n λ λ = + = + (2) Solving for the order number, m , in equation (1), and substituting into equation (2) gives the film thickness as ( ) ( ) ( ) 500 nm 313 nm 4 1.20 1 500 nm 750 nm 4 1 dark film dark bright t n λ λ λ = = = 24.69 (a) Assuming that n in the figure at the right, Ray 1 undergoes a phase reversal as it
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