Phillips, Percy · London : T. C. & E. C. Jack ; New York : Dodge Pub. Co. · leaf 36
n at A, andthe wave-front at B will travelfaster than at A. This willhappen at all points in thepath of the wave, and there-fore the end B will gain onthe end A and the wave-frontwill become more horizontal. Mirage.—Another well-known example of refractionin a medium of varying density is the… … Fig. 20. Eve 4-—-x-; -vtr,r--
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