You told me those were the rules for no phase change.kuruman said:I gave you two equations for the constructive and destructive interference conditions in post #28. What part about them is confusing you? You have ##\Delta L## on the left hand side and a quantity that is a number times half a wavelength on the right hand side. That's how you relate the path length difference to the wavelength.
This is really stressing me out now and I'd like some more guidance please I've got 4 different answers