Physics of Rainbows

I just added a short appendix to The Art of Rainbow Engineering giving a bit more detail on the science. I did intend to do this when I first wrote the story, but never finished it, as doing diagrams is rather tedious.

Now if anyone in the university asks why I spend so much time on fimfiction, I can say it's a public education project.
I'm currently working on another science themed story which will look at the physics (or lack of) behind the sonic rainboom.