Hello! I am trying an interferometry experiment using the Michelson Morley experiment. I managed to obtain the interference pattern on a screen, but I want to use an photodetector and I am not sure what should I obtain. As I know, the oscilloscope shows the intensity of the light, so if I modify the interference pattern, the intensity should change, but I don't understand why should I see the bright and dark lines on the photodetector. And if I don't see this, what is the point of using an photodetector in this case? Thank you!