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Jul 9, 2019 at 15:18 comment added PhysicsDave In the classical world we say there is "interference" when we see a dark (or bright spot) on a screen, but we also know that interference in the dark spots would be a violation of energy conservation. There are mounds and mounds of papers thru the early 1900s and education that tries to explain this classically, but it is not until we understand the wave function of light that we realize dark spots are where there is no energy or no photons as pathways here are not allowed.
Jul 9, 2019 at 15:16 comment added PhysicsDave Its not clear whether the question refers to double slit or possibly some kind of interferometer in her/his setup. We know that in the EM field, EM waves must superimpose as observations show beams do not "interfere" with each other when crossed for example.
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