Six lectures on light : delivered in America in 1872-1878 (1886)
Tyndall, John, 1820-1893 · New York : D. Appleton · leaf 141
ocity in air, the wave would be retarded on passinginto the denser medium. But suppose the wave, before reaching the glass, tobe oblique to the surface; that end of the wave whichfirst reaches the medium will be the first retarded byit, the other portions as they enter the glass being re-tarded in… … its original direction. According to the undulatorytheory, light is thus refracted. With these considerations to guide us, let us followthe course of a beam of monochromatic light throughour glass prism. The velocity in air is to its velocity inglass as 3 : 2. Let a B c (fig. 27) be the section of…
Light
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