The [[Displacement]] of the reflected [[Wave]] $D_R$ to the displacement of the incident [[Wave]] $D_I$ and the transmitted pulse wave $D_T$ is: $\huge \begin{align} \frac{D_{R}}{D_{I}} &= R = \frac{c_{2} - c_{1}}{c_{2}+c_{1}} \\ \frac{D_{T}}{D_{I}}&= T = \frac{2c_{2}}{c_{2}+c_{1}}, \end{align}$ $\huge 1 = R^{2} + \frac{c_{1}}{c_{2}}T^{2} $