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I am having a little difficulty articulating my question, so please bear with me. I understand that when waves occupy the same space at the same time, they interfere. What I am having difficulty visualizing is when two different waves travel different paths and intersect at some point; in particular, when they reflect of surfaces at certain angles, etc. To give some context, I am reading about compton scattering and x-rays at the moment, and they are assert if the difference in path lengths of two lights of the same frequency are some integer multiple of their wavelength, then if they intersect at some point in time in space, they will interfere constructively.

If anyone knows of a simple way of explaining this, and perhaps has some visual aid that I could not find on the internet, I would be very grateful

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# Path Different Between Two Waves

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