Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 78
es aregreater; the least refrangible rays being, as it were, contract-ed in the former and expanded in the latter, while the mostrefrangible rays are expanded in the one and contracted in theother. In consequence of this difference in the colored spaces,the middle or mean ray m n does not pass… … green space. As the colored spaces have not the same ratioto one another as the lengths of the spectra which they com-pose, this property lias been called the irrationality of disper-sion, or of the colored spaces in the spectrum. In order to ascertain whether any prism contracts or ex-pands the…
Optics
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