Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 548
from an originalsource, j9, or from a series ofpoints through which the wave FlG 3-6 front passed an instant before. This mode of regarding the disturbance at any point ofa wave front as the resultant of the separate disturbanceswhich would have been produced by each point in the wavefront acting… … 480. Reflection and Refraction.—Suppose that AB (Fig.357) represents the smooth interface between two media ofdifferent density, the denser one being below. By a smoothsurface is meant one in which the roughnesses are small 538 WAVES.
Physics
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