Light and Reflections in Space

[Marc_72]

I am reading Feynman's book on QED and something struck me about light. I know that we can only calculate the probability of where a photon goes. After that I came across how a partial reflection affects light. My question is, is there a place in the universe where there is a great thickness of matter or energy that light reflects off of?p.s I apologize in advance if I am in the wrong forum.

 

[berkeman]

Welcome to the PF.

Do you mean like a Reflection Nebula? https://en.wikipedia.org/wiki/Reflection_nebula

 

[Spinnor]

where there is a great thickness of matter or energy that light reflects off of?

You don't have to go very far. Gold can be formed into very thin sheets several millionths of an inch thick and it will reflect most of the light incident upon it.

But I am pretty sure that is not what you were thinking?