p36_030 - 30. The fact that wave W2 reects two additional...

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30. The fact that wave W 2 reflects two additional times has no substantive eFect on the calculations, since two reflections amount to a 2( λ/ 2) = λ phase diFerence, which is eFectively not a phase diFerence at all. The substantive diFerence between W 2 and W 1 is the extra distance 2 L traveled by W 2 . (a) ±or wave W 2 to be a half-wavelength “behind” wave
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