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Illustration Double-slit Experiment - Constructive interference

Double-slit Experiment - Constructive interference
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According to the Huygens principle, at every point of the plane wave spherical waves are generated, which propagate further behind the slits and interfere with each other. Where a wave crest meets a wave crest, or a wave trough meets a wave trough, there is constructive interference. This is how interference maxima (bright spots) are created on the screen.