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## Main Question or Discussion Point

This is a very easy question. I just finished reading Feynmans book QED, and I was wondering, the probability of a photon going from one place to another is dependant on the distance between the two points right? Is there any underlying mechanism which explains this? I know that the probability is determined by the difference between all the possible routes the photon can take, but I dont see how this has anything to do with the distance.

Thanks.

Thanks.