Lectures on light, delivered in the United States in 1872-'73; with an appendix (1873)
Tyndall, John, 1820-1893 · New York, Appleton · leaf 28
ssel(Eig. 1), AC being the water-line. When the beam SNELLS LAW OP REFRACTION. 23 is incident along B E, whicli is perpendicular to A C,there is no refraction. When it is incident along mE, there is refraction: it is bent at E and strikes thecircle at 7i. When it is incident along m E, there isalso… … p n, p ti be also drawn. Measure the lengths of o mand of 2> >h and divide the one by the other. You ob-tain a certain quotient. In like manner divide m oby the corresponding perpendicular 2^ f^; you obtainin each case the same quotient. Snell, in fact, foundthis quotient to be a constant…
Optics
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