For example, you can open the following built-in sample.
\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.
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.
Why is shift happen?
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A good explanations can found in the following documents:
The following is an abstract.
In OpticStudio, we use the thin film convention. Therefore, when calculating the phase retardance, the following equation should be used.