Struggling with Total Internal Reflection? Need Help for Exam Prep?

[aurao2003]

Homework Statement

Hi
I wonder if anyone can help. I am having difficulty drawing refracted and total internally reflected rays. I have an exam on Monday. Can anybody recommend good websites that can help? Slight panic.

Thanks

Homework Equations

The Attempt at a Solution

 

[Doc Al]

http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/totint.html"

http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/refr.html#c3"

 

[aurao2003]

Thanks a lot!