AN EXPLANATION OF A DIFFICULTY WITH HUYGENS' SECONDARY WAVELETS
1996
Huygens' construction for the propagation of a wave front using secondary wavelets gives rise to a paradox, that a backward travelling wave is predicted, but this wave does not exist. This paradox is resolved by postulating two wavelets that cancel in the backward direction. Kirchhoff's diffraction integral is examined in the light of this postulate.
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