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huygens' principle

huygens' principle in Science
Huygens' principle  
The principle that any point on a wave front may be regarded as a source of spherical or circular wavelets. The sum of all such wavelets emanating from the front is same as the wavefront itself. This principle can be used to derive the laws of reflection and refraction. See also superposition.
The American HeritageĀ® Science Dictionary
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