- In double-slit experiments it's said that observing a particle in a slit will result in two distinct bands. Why wouldn't there be single-slit diffraction?
Main Question or Discussion Point
From what I understand, if the two-slit experiment is performed while observing a slit for particles, two distinct bands appear rather than interfering. This is a little confusing, as, from what I understand, diffraction is caused by measuring a particle's position (i.e. using a slit to narrow down its position), which results in uncertainty in momentum and contributes to the interference pattern. If that is the case, why wouldn't even the slit without the detector show single-slit diffraction? Also, if diffraction is caused by momentum uncertainty, why would it result in bands where particles are absent; wouldn't that reduce momentum uncertainty?