ch35-p007 - 7. The fact that wave W2 reflects two...

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effectively not a phase difference at all. The substantive difference between W 2 and W 1 is the extra distance 2 L traveled by W 2 . (a) For wave W 2 to be a half-wavelength “behind” wave W 1 , we require 2 L = λ /2, or L = λ /4 = (620 nm)/4 =155 nm using the wavelength value given in the problem. (b) Destructive interference will again appear if W 2 is
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