Speed of light through Glass

[microb]

Why does light slow down in water?
There are many mysteries of physics for which you can find explanations online and some of those explanations are wrong. In this video, Fermilab’s Dr. Don Lincoln takes on the mystery of why light travels slower in water and glass. He lists a few wrong explanations and then shows you the real reason this happens.
https://www.youtube.com/watch?v=CUjt36SD3h8

Why does light bend when it enters glass?
The motion of light depends crucially on the material in which it is traveling. When light passes from one medium to another, an unexpected thing happens: the direction of travel changes. There are many explanations for why this happens and many of those explanations are wrong. In this video, Fermilab’s Dr. Don Lincoln explains the real reason.

Correction: Dr. Don is aware that the direction the plus and minus charges moved at 12:02 is backward. He apologizes.
https://www.youtube.com/watch?v=NLmpNM0sgYk

[MichaelG.]

Excellent link, thanks !

MichaelG.

[Greg Howald]

Cool. Greg

[apochronaut]

It's all a frame of reference.

https://youtu.be/bJMYoj4hHqU

[Phill Brown]

Now I know to butter the underside in monochrome so it lands the right way up.
No mention anywhere to sods law.