Huygens' concepts of secondary wavelets:

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(C) Huygens' principle states that every point on a primary wavefront acts as a source of secondary wavelets,which spread out in all directions with t

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Are a geometrical method to find a wavefront

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(C) Huygens' principle states that every point on a primary wavefront acts as a source of secondary wavelets,which spread out in all directions with the speed of light in the medium.The new wavefront at any later time is the forward envelope of these secondary wavelets.Therefore,Huygens' concepts of secondary wavelets provide a geometrical method to determine the shape and position of a wavefront at a subsequent time.

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