Because the reduced wave equation (14.9.49) is linear, we can simple let u = A(X, Y
Chapter 14, Problem 14.9.11(choose chapter or problem)
Because the reduced wave equation (14.9.49) is linear, we can simple let u = A(X, Y, Z)ei, where solves the eikonal equation (14.9.53). Find the exact equation for A and the leading-order equation.
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