10_Chapter 24 HomeworkCH24 Wave Optics

10_Chapter 24 HomeworkCH24 Wave Optics - 312 CHAPTER 24...

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312 CHAPTER 24 24.14 With film air n > n , light reflecting from the front surface of the film (an air to film boundary) experiences a 180° phase shift, but light reflecting from the back surface (a film to air boundary) experiences no shift. The condition for constructive interference in the two reflected waves is then 1 2 film nt m 2 λ  =+   with m 0, 1, 2, = For minimum thickness, , giving 0 m = min 4 film t n = (a) With 656.3 nm and 1.330 film n == , () min 656.3 nm 123.4 nm 41 .330 t (b) When 434.0 nm and 1.330 film n , min 434.0 nm 81.58 nm t 24.15 Light reflecting from the upper surface undergoes phase reversal while that reflecting from the lower surface does not. The condition for constructive interference in the reflected light is then
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