Observer's Dilemma
In Young's Double Slit experiment, Interference pattern depends on the position of the detector. Here are the experiment data results, A single photon is sent at a time and next is sent when previous photon hits the screen. 1. If a detector is placed just after the source then observer will not be able to find the slit in which electron is going to pass so the interference pattern will appear on the screen. Interference pattern (Fringes) appears because electron acts as a wave and passes through both the slits. 2. If a detector is placed just before the slits then observer will be able to find the 'which way' path of the electron and interference pattern will not appear on the screen. We will see the two fringe pattern on the screen. 3. If a detector is placed just after the slits then observer will be able to find the 'which way' path of the electron and interference pattern will not appear on the screen. You must think, if interference pattern will not a...