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Illustration Double-slit Experiment - Destructive interference

Double-slit Experiment - Destructive interference
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According to the Huygens principle, at each point of the plane wave arriving at the double slit, spherical waves are generated, which propagate further behind the slits and interfere with each other. Where a wave trough meets a wave crest there is destructive interference. In this way interference minima (dark spots) are created on the screen.