Chapter 8, Problem 34P

To determine

The proof that the expression for the reflection coefficient for parallel polarization ${\Gamma }_{\parallel }$ is in the form ${\Gamma }_{\parallel }=\frac{\tan \left({\theta }_{\text{t}}-{\theta }_{\text{i}}\right)}{\tan \left({\theta }_{\text{t}}+{\theta }_{\text{i}}\right)}$.