\Documents\Zemax\Samples\Sequential\Tilted systems & prisms\Prism using total internal reflection.zmx
If you check the "Phase vs. Angle", you can see the phase delay introduced to S and P polarization.
![](https://uploads-us-west-2.insided.com/zemax-en/attachment/191106-111346-2019-11-06_11-13-28.jpg)
And if you check in Wiki page, you can find the phase delay for P polarization has a shift of pi compared to the result in OpticStudio.
https://en.wikipedia.org/wiki/Total_internal_reflection#Phase_shifts
![](https://uploads-us-west-2.insided.com/zemax-en/attachment/191106-111802-840px-phase_advance_at_internal_reflectionsvg.png)
Why is shift happen?