Six lectures on light : delivered in America in 1872-1878 (1886)
Tyndall, John, 1820-1893 · New York : D. Appleton · leaf 49
is benttowards the perpendicular ; when it passes from waterto air, it is bent/rom the perpendicular, and accuratelyreverses its course. Thus in fig. 5, if 971 e ti be the tracktaken by a ray in passing from air into water, n B mwill be its track in passing from water into air. Letus push this… … before entering the water. After refraction it will pur-sue the course e v/\ Conversely, if the light start fromv/, and be incident at e, it will, on escaping into theair, just graze the surface of the water. The questionnow arises, what will occur supposing the ray from thewater follows the course…
Light
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