raindropper

…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.

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.