In the double slit experiment you can see the electromagnetic waves as curved lines that go through both slits and interfere with each other.
But, don't electromagnetic waves look like this.
So, three questions
1: What do the curved lines in the double slit experiment represent, is it the EM waves?, if so why do they are they like that?
2: Why can light be thought of as a water wave that propagates outwards in every direction? (like in the double slit experiment)
3: I heard If you were to put a detector on the two slits and see which slit the photons went through the photons wouldn’t display any interference pattern is this true? If so what causes it?
Thanks in advance for the replies.