O:

I studied for the chapter on Refraction and Dispersion of light this morning.
That left me mad. D:
This video helps, it's damm old, ya, but damm good and it's easy to follow. Ignore the part where the Index Of Refraction comes out, it is not in our syllabus.
But the best part is, it did mention about the Angle Of Refraction, one of the things we have to know. I think it is not in the textbook, right? :D
Anyway, this thing was my savior, DON'T LAUGH!
It would be yours, too!