# Urgent! - Plane Wave Total Internal Reflection Problem

by marksambob
Tags: internal, plane, reflection, urgent, wave
 P: 183 The first part can be done by just considering that the field inside the medium can be represented as a sum of cosine/sine waves corresponding to the reflected and incident wave. The reflected ray will have experienced a phase delay upon reflection according to the Frensel equations. So the corresponding maximum (if we consider cosine waves and set the boundary at z = 0), will be the distance that the half of this phase delay corresponds to. I agree with your expression for $\alpha_2$ except for the $\beta_2$ term. Unless the material in which the wave is travelling is lossy, why would you expect there to be attenuation in the x direction?
 P: 183 Sorry, missed the j term in the exponential with $\beta_2$. But I still think it doesn't belong in the expression for $\alpha_2$. It corresponds to the propagation constant in the x direction.