If a single photon light source shoots a photon through the "attached" path. What is the percentage of the photon will make it to each detector. The light source is the box, the photon trajetory is yellow, beamsplitter is blue, mirror is black, detectors are purple, and obstacle is red. I think because of the indistinguishabillity principle, the photon will go 50% to each detector because there is a physical disturbance in the trajectory(obstacle). Any thoughts?