Translations:Huygens’ principle/8/en

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Thus far, we merely have stated Huygens’ principle without any justification or proof of its validity. Figure 11 shows a wavefront as well as several spherical secondary wavelets that after a time have propagated out to a radius of . The envelope of all of these wavelets then is claimed to be the advanced wavefront. This figure represents a graphic application of the essential ideas and as such is known as Huygens’ construction. However, as we see in the figure, there is also an envelope of the secondary wavelets to the rear of the wavefront.