The pattern behind the double slit is the result of interference between photons emerging from each slit, regardless of whether there's a lot, or if there's *only* one. Each individual photon leaves ...

In the famous double-slit experiment, an interference pattern consisting of dark and bright bands emerges when a beam of light hits two narrow slits. The same effect has also been seen with particles ...

Classical physics theories suggest that when two or more electromagnetic waves interfere destructively (i.e., with their electric fields canceling each other out), they cannot interact with matter. In ...