Six lectures on light : delivered in America in 1872-1878 (1886)
Tyndall, John, 1820-1893 · New York : D. Appleton · leaf 157
x of Iceland spar is, for the extraordinaryray less, and for the ordinary greater, than for Canadabalsam. Hence, in passing from the spar to the balsam,the extraordinary ray passes from a less refracting toa more refracting medium, where total reflection cannotoccui*; while the ordinary ray passes… … of which 6 c IS the section shall be perpendicular, ornearly so, to the two end surfaces of the rhombb X, c y. The invention of the Nicol prism was a great step inpractical optics, and quite recently such prisms havebeen constructed of a size and purity which enableaudiences like the present to…
Light
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