[almostgotcaught]

> There's the concept of permittivity

> You require material equations to model interactions of EM with media

> Quantum electrodynamics (QED) which can model interactions of EM and matter.

It's amazing how condescending some people on here are; how could you possibly have missed literally in the first sentence of my response

> ... my physics degree

[kuhsaft]

> It's amazing how condescending some people on here are

You literally started your comment with "Lol news to me", then you used your degree as if it made you more knowledgeable than anyone else here. Take a look in the mirror?

> ... Do tell

I did?

The extra information isn't to condescend. It's for other people that want to know more about the science.