In the double slit experiment, when we send out one photon at a time, what does the appearance of minima in our interference pattern mean? When a single photon is fired, I understand (using "understand" very loosely) that the photon will interfere with itself. When this happens, does it still have to land on the wall in front of the slit and it is limited to the bright bands defined by interference, or are there times where we will fire the photon and it will destructively interfere with itself and we won't see it land on the wall? Because if that's the case, energy would just be disappearing. I can try to clarify if need be. Thanks!