Double slit diffraction and interference

Our theory of 'edge attraction' fails completely, however, when we go one step further, and send our 'beam of separated photons' through two thin slits close together. Again we get the same result as we got with light of full intensity. As in the 'standard' Young's experiment, the region of overlap of the two beams consists of bright and dark fringes. The dark fringes are regions of destructive interference of light from the two slits. But this seems impossible. This time we can hardly talk about two beams. Photons arriving one at a time, separated by 10 km, can hardly interfere with one another!

Single photons make the same pattern as waves when they come through two thin slits!

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