What makes Glass and some types of Plastic clear? Why couldn’t we make clear metal or other “clear” Materials?

Question

What makes Glass and some types of Plastic clear? Why couldn’t we make clear metal or other “clear” Materials?

In: 305

Answer 1

Here is an explanation from a physicist (https://youtu.be/Omr0JNyDBI0).

Tldw: Some materials have the property that incoming photons can’t excite their electrons to the point where the photon is absorbed, so the photon, and therefore light, passes through.