Phillips, Percy · London : T. C. & E. C. Jack ; New York : Dodge Pub. Co. · leaf 25
fter the impact. It will thenswing back and start a disturbance travelling backagain to D. We may now imagine the two rows ofballs to be two media whose surface of separation is atthe point between B and C. When any disturbanceoriginates in one of the media it is propagated throughit until it… … Fig. 7. therefore each point in the surface of separation isconsidered as a new source of disturbance, and we mayinvestigate the laws of reflection by constructing theHuygens secondary wavelets from these points. Reflection of a Plane Wave by a Plane Surface.—Let us take as our simplest case a…
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