Another question

Could you direct me (like HW so and so) to an example of the kind of refraction problem I should be looking at? They range from easy to REALLY hard and I don't know. HELP.

Study problems more like the easier ones - the quiz 9 problems, for example. Not the pathological ones like atmospheric refraction or prisms.

A couple of other examples that are useful to look at:

PH102 Fall 2007, Exam 2, problems #9 & 10
PH102 Fall 2007 Final, problem #9
PH102 Spring 2008 Exam 2 #6 & #7

If you understand these problems, you basically have things under control.