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This is from a hw problem and i kno how to solve it with formulas but i dont kno whats actually going on. So in the diagram above, light is emitted from S1 and S2, and you want to find the furthest point P at which the light interferes destructively. S1 and S2 are separated by a few micrometers, and the answer was also on the scale of micrometers. But, I dont see why the light cant interfere beyond P. I mean, if you draw concentric circles representing the wavefront around each of the points S1 and S2, then it seems the wavefronts still intersect each other in various ways in all directions, including all along x axis...

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# Furthest point at which light interferes

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