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Aug 21 at 11:32 comment added FlatterMann @agaminon Photons do not "overlap". A photon is the amount of energy, momentum and angular momentum that an electromagnetic field exchanges irreversibly with an external system (usually called "source" and "absorber" or "detector"). The photon density in diffraction experiments is proportional to the classical intensity. That explains why Young did not discover quantum mechanics in 1801, a hundred years before Planck. Diffraction is simply not dependent on quantization. It occurs just as well in water and acoustic waves.
Aug 20 at 8:47 history edited Vercassivelaunos CC BY-SA 4.0
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Aug 20 at 0:09 comment added agaminon I really like this answer. I wasn't aware that the photons in the "detector" case overlap single interference patterns, though that makes a lot of sense.
Aug 20 at 0:04 history answered Vercassivelaunos CC BY-SA 4.0