I drew a prism in Desmos Graph calculator, a free on line software on the Internet to google it.

I used 60 Deg prism.

You can run this simulation on your computer., of one incident and Green beam and one violet colored refracted beam.

1- The incident angle is 0 Deg, It goes thru without deviation.

2 - The incident angle is between 0 and 90 Deg.

3- The incident angle is 90 Deg.

Note: There is another pair of incident / refracted beams to exit from the prism,

I left it out for you to figure if out.

Here are the instructions to run the Simulation:

Once you enter that sequence of 15 instructions, you can run the animation by clicking on the ‘Play Button” on the left line numbered 6.

Cheers!