Ooooh, I completely forgot that it was time for ray diagrams. It's one of my favourite things to teach - part physics, part technical drawing, part maths, it's the one topic I can be sure that (nearly) everyone can do.
Of course, it's also one of the topics that requires PRACTICE. Lots and lots and lots of it. Of course, that means that I have to repeat the same demonstrations again and again and again. So I am working on a screencast right now. I'll post it soon.
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