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Huygens principle

noun, Optics, Physics.
1.
the principle that all points on a wave front of light are sources of secondary waves and that surfaces tangential to these waves define the position of the wave front at any point in time.
Origin
1830-1840
1830-40; named after C. Huygens
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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