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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.
p.s I apologize in advance if I am in the wrong forum.