Double Slit

Wheeler's delayed choice experiment is a thought experiment in quantum physics that was proposed by physicist John Archibald Wheeler in 1978. The experiment is designed to explore the nature of wave-particle duality and the role of observation in quantum measurements. Case : A The experiment involves a setup where a beam of photons is directed towards a beam splitter at lower left corner. There is 50-50 probability that the photons will be transmitted (pass through straight direction to the bottom right mirror) or reflected (sent to the top left mirror).  At beam splitter, if photon is transmitted, it is sent to the mirror which is placed at the lower right corner. It will reflect the photon to the top of the apparatus where screen - A is placed At beam splitter, if photon is reflected to the top left mirror, it will reflect the photon to the top right where screen - B is placed.  In both cases we will find the path of the photon. Either it follows clockwise route or anti cl...

 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...