Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 215
e only the central portion, but no device has yet been found by which it can be entirely removed. 713. Caustic Curves. When light isreflected from the inside of a cylindricalmirror, it produces a double curve of light,with darker spaces between, Fig. 239.These are caustic curves, and are wellshown… … Fig. 239. 714. Chromatic Aberration. A lens is really a prism ofan infinite number of sides. Hence it decomposes whitelight like a prism, and brings the violet rays to a focusnearer the lens than the less refrangible rays, like the red.This produces a series of colored rings when a screen isplaced…
Physics
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