Why do rays pass straight through the center of a lens?
10:12
Example: Computing Optical Path Length
12:42
Example: Two-Lens Imaging with converging lenses
6:04
What is Optical Path Length?
23:22
What *is* a photon?
8:31
Example: Optical Path Length (with phase shifts)
8:30
Why does E=MC²?
17:54
Je me suis toujours demandé si les champs électromagnétiques étaient réels !
14:26