Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 220
ually diminishestill the air becomes so rare as scarcely to be able to pro-duce any effect upon light. When a ray of light falls ob-liquely upon a medium thus varying in density, in place ofbeing bent at once out of its direction, it will be graduallymore and more bent during its passage through… … 216 A TREATISE 01V OlTICS. PART III. the earlh, surrounded with an atmosphere ABCD, consistingof four concentric strata of different densities and differentrefractive powers. The index of refraction for air at theearths surface being 1-000,294, let us suppose that the indexof the other three strata…
Optics
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