Translations:Wavefronts and raypaths/2/en

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For our present purpose, we define the leading-edge wavefront as the most forward position of the advancing region of the disturbance at any particular instant in time. Behind the leading-edge wavefront, the medium has been disturbed. Ahead of the leading-edge wavefront, the medium is undisturbed. This is the physical effect of the original disturbance as it propagates from its source point.