When I was reading about the double-slit experiment in quantum mechanics, everything seems to make sense in terms of the waves and the interference pattern, but if thinking more about this observation, it brought up more questions on this experiment.
In basic terms, what does it mean for humans to observe an electron being fired from the gun and seeing it during flight? Our eyes observe electromagnetic radiation and photons are hitting our eyes and the senses in our eyes create a picture.
As I understood it, when we see a tree outside, the sunlight/photons from the sun hit the tree and bounced back into our eyes (is this correct?). Does that mean sunlight/photon from a sun, hit the flying electron and bounced back to hit our eyes? If that is the case how does this work? It becomes way crazier if you think about this more. I actually took this "observing an electron during flight" for granted, but it seems like photon observing a photon or photon hitting a single photon and then creating an angle by bouncing back and hitting our eyes? If the photon hit the photon, does that change the flying photon that is about to go through the double slit, because it is hitting that photon?
Can someone describe to me how you understood this mechanics? Am I correct in how I described it or wrong? Here in quantum mechanics, there comes the time where "observation" "collapses the wave-function" if people believe in wave-function collapse by observation.