Single slit diffraction and double slit diffraction are very different. This difference is elegantly and simply explained by the wave model. Without it, you'd e

Single slit diffraction and double slit diffraction are very different. This difference is elegantly and simply explained by the wave model. Without it, you'd expect the double slit experiment to create a simple sum of the pattern from each of the slits, but what you get is a completely new pattern that depends on the spacing between the slits, and the wavelength of the thing passing through.