Huygens's Principle

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The Huygens principle states that every point of a wave front at any instant may be considered a source of spherical secondary wavelets with a speed equal to the speed of the the overall wave. Basic wave phenomena like refraction and diffraction can be explained using this principle.
Contributed by: Enrique Zeleny (March 2011)
Open content licensed under CC BY-NC-SA
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"Huygens's Principle"
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Published: March 7 2011