There's a handwavy mention in the article of "photonic technology", but they didn't describe any photonic technology. There's a fair bit of handwaviness, I thi

There's a handwavy mention in the article of "photonic technology", but they didn't describe any photonic technology. There's a fair bit of handwaviness, I think. Isn't the extent to which a light-beam is bent a function of the angle of incidence, and not of the amount of glass it has passed through?