![]() That same wave-like pattern shows up for light, as first noted by Thomas Young in a series of experiments performed over 200 years ago. This combination of an interference pattern - with alternating regions of constructive (additive) and destructive (subtractive) interference - is a hallmark of wave behavior. At other locations, the ripples cancel one another out, leaving the water perfectly flat even as the ripples go by. ![]() At some locations, the ripples will add up, creating larger magnitude ripples than a single wave alone would permit. If you take a tank filled with water and create waves in it, and then set up a barrier with two “slits” that allow the waves on one side to pass through to the other, you’ll notice that the ripples interfere with one another.
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