Translations:Reflection coefficients and transmission coefficients/14/en

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The reflection and transmission coefficients usually refer to a downgoing incident wave. What are the respective coefficients for an upgoing incident wave? Let the coefficient subscript U denote an upgoing incident wave. We want to determine the reflection coefficient and transmission coefficient for an upgoing incident wave in the lower medium with impedance , when the wave strikes an interface with the upper medium with impedance (Figure 2).