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Apr 30, 2021 at 18:56 comment added S. McGrew I think, after you've digested all the answers you can get, you will conclude there are not any particular dimensions or shape.
Apr 30, 2021 at 18:10 comment added Jarek Duda There is also a third one: single photon being EM field or its quantum ensemble - its dimensions, shape I am asking about.
Apr 30, 2021 at 17:46 history answered S. McGrew CC BY-SA 4.0