Young's double slit experiment

electron gun firing through slits

In Young's famous experiment he fired electrons through a barrier with two narrow slits and detected them on a screen on the far side. You might have expected that most of the electrons would cluster around the centre of the screen; however, you would be wrong! There is a strong central band, and then bands where no electrons appear and then more strong bands further away from the centre. To understand this we need a different understanding of the electron...

drawing by Tom Brown