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…is something that wasn’t taught on my physics lessons. It’s one of the most interesting and mysterious phenomena, and as yet unexplained by scientists.

Put simply, the experiment goes like this: shoot photons through a plate which has two slits on it, to a photographic film. An interference pattern appears on the film – even if you shoot the photons one by one, during a period of time.

Double-slit experiment

Here’s a movie of the experiment.

The question is: from where the interference pattern emerges, how do the photons know where to land on the film to create this pattern? There’s only one photon “on the air” at a time so with what it is having an interaction?

More info on Wikipedia.


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