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  1. $x_1 = 180 \textrm{ nm}$
  2. $x_2 = 360 \textrm{ nm, } x_3 = 540 \textrm{ nm}$
  3. there would be only a phase difference of one half wavelength, which is destructive.

Giancoli 7th Global Edition, Chapter 24, Problem 45

(3:20)

Chapter 24, Problem 45 is solved.

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