The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies (1856)
Sprague, A. W. (Alfred White), 1821-1891 · Boston : Phillips, Sampson & Company · leaf 315
THE RAINBOW. 309 opposite the sun, and usually has a second less brilliant attend-ant just above it, termed the secondary bow. The rainbow isonly seen when a shower of rain is falling, or the spray from acataract is rising between the spectator and that portion of theheavens opposite the sun. The… … bow. Let r v be two drops of rain, on which the solar rays,S S, are incident. The ray falling on the upper portion of thedrop will be refracted, and, passing to the back of it at anangle with the surface of the drop at that point, within thelimiting angle (§ 280), will be totally reflected and…
Physics
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