Hello, first post. I recently became interested in quantum physics and its mysteries. To my understanding, In the double slit experiment, the photon or electron will scatter and behave like a wave when both slits are open and neither slit is measured. Over time their cumulative scattering mimics what the interference pattern for what a wave would look like upon hitting the wall. Now, it is my guess that each individual photon or electron upon passing through the slit (... or both slits?) ends up having a particular trajectory that aims it towards one of the locations on the final wall where its wave would register as not canceling itself out. My question: Do we have any knowledge or formulas to show what would cause that photon or electron to take that particular trajectory as opposed to another acceptable trajectory for where its wave would register and not cancel out? Or... is it instead believed that no further causes can exist at this point and its trajectory is truly a random probablity? And that the best we can have is a probability function for its possible trajectories?