Translations:Huygens’ principle/10/en

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Figure 10.  (a) A plane wavefront at a certain instant in time. At a later instant, the advanced wavefront is the envelope of all the small wavelets excited by each point of disturbance on the original wavefront. (b) A similar construction for an advancing spherical wavferont. (c) It is evident that such a construction will be valid for a wavefront of any arbitrary shape, such as the one shown here.