Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 210
s proved by placinga second prism in the path of any one of the colors: thelight is still farther displaced, but its color is unchanged.So by constantly displacing the light by a series of prisms,the light can be so extended as to become too faint to berecognized by the eye, but so long as it can… … 200 OPTICS. base is in the position of the edge of the first, the lightwhich passes through is again white. Or the spectrumreflected to a focus by a concave mirror gives a white light. Newtons Disc. The easiest proof ofthe composition of white light is NewtonsDisc, Fig. 229. This is a piece of…
Physics
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