Now my question: It should be easy to place two detectors very close behind the slits (too close to allow interference) in a way that each detector clicks only when a photon (or electron, etc) travelled through its associated slit.when electrons are fired at the target screen in bursts, it is easy to account for the interference pattern that results by assuming that electrons that travel in pairs are interfering with each other because they arrive at the screen at the same time, but when a laboratory apparatus was developed that could reliably fire single electrons at the screen, the emergence of an interference pattern suggested that each electron was interfering with itself; and, therefore, in some sense the electron had to be going through both slits. (my bold)
What will happen?
a) both detectors will click simultaneously (the photon travelled through both slits)
b) only one of them (inpredictably) will click (the photon passed only through one of the slits)
c) something else will happen (e.g. neither d1 nor d2 will click)
d) no answer to that silly question
e) this has been discussed before (please give a link)