Btw, for those of us who don't have a PhD in physics, I thought I'd share my discovery of Snell's Law. ( courtesy
https://en.m.wikipedia.org/wiki/Snell's_law).
Ready?
View attachment 86116
Gottit?
Oh, you want more? Okay, courtesy same page (you know I'm in over my head when I quote from Wiki):
Snell's law (also known as
Snell–Descartes law and the
law of refraction) is a
formulaused to describe the relationship between the
angles of incidence and
refraction, when referring to light or other
waves passing through a boundary between two different
isotropic media, such as water, glass, or air.
There's also stuff about negative refraction indices -- but I forget where that fits in.
Now I'll need another half-year to figure out how that works with my diaphanous bus stop shadow selfie