Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 262
lcohol 1*372 Oil of cloves 1-535 Crown glass 1 534 Plate glass 1 542 Flint glass 1 830 Do. containing much lead 2028Diamond 2*439 This knowledge enables us to trace a rayof light through transparent bodies of anyform, provided we can find the inclinationof the incident ray to the surface, where… … point a, will be refracted by the first sur-face into the directions b b, and by con-tinuing a a, and b b, backwards, we shallfind they meet ar, a point beyond a : sothat supposing the eye to be placed withinthe body g, the point a w./uld appear re-moved to b. But when the rays undergoa second…
Photography · Art and photography
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