Total Internal Reflection Question

[BrooklynBees]

I have written in my notes the following:

"Total internal reflection will have reflecting ray only, same as incident (60 degrees)."

I understand everything but the 60 degrees part. If there is total internal reflection, will the angle of reflection and the angle of incident both always be 60 degrees? That doesn't make sense to me.

 

[Opario]

The rule for reflection is, of course, that the incident angle equals the reflected angle. 60 degrees was quite likely just an example that you have since forgot about. At least, I can't think of any TIF rule that has to do specifically with 60 degrees.