So I have an exam tomorrow, and I'm pretty clear on all the topics. However, I'm having a little trouble with Snell's Law. I understand the majority of it, but a few points are still unclear to me. 1.Total Internal Reflection- I understand the definition (sort of) but I can't picture an example 2. Mirages- I know it deals with total internal reflection but I'm unclear on how it occurs. Two example I would love to have explained are mirages by puddles in the street and mirages in the desert. Can someone help me understand these topics? Thanks!