Henderson, C. Hanford (Charles Hanford), 1861-1941, Woodhull, John F. (John Francis), 1857-1941 · New York, D. Appleton and company · leaf 342
hence the wave frontswings around to It h\ andthe beam itself, which mustalways be perpendicular to thewave front, takes the newdirection shown, bent toward / M¥§i the common perpendicular, /rf<-,,),// hli. When the beam is per- / pendicular to s s, the wave fig. 216.— Refraction. front IV, is… … 320 PHYSICS light in the first medium to the velocity in the second.When, therefore, light passes into a medium of greaterdensity, the index is always greater than one, and the rayis bent toward the common perpendicular. When lightpasses into a medium of less density, the index is alwaysless than…
Physics
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