effectively not a phase difference at all. The substantive difference between W2and W1is the extra distance 2Ltraveled by W2. (a) For wave W2to be a half-wavelength “behind” wave W1, we require 2L= 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 W2is
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