Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 300
g whichthe waves travel, and it is seon that theray is perpendicular to the wave-surface.* „ „,„ ^, ^ r r Fig. 319.—The waves are If we consider a number of rays spheres with ^ as centre; «/ the rays are radii of these moving out from A (Fig. 320) we have spheres,what is known as a divergent pencil… … 290 NATURE OF LIGHT ; ITS MOTION IN STRAIGHT LINES and tlie waves are concentric spheres continually growingsmaller. If now the rays are parallel, as in c, we have a _ c u _i r -1 1 • I A
Physics
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