[Coffin, John Huntington Crane], 1815-1890. [from old catalog] · New York, D. Van Nostrand · leaf 58
, the normal line, or perpendicu-lar, to the separating surface at b. If a J is the incident ray, b e is the refracted ray ; P b ais the angle of incidence / P b a1 is the angle of refraction. If c b is the incident ray, b a is the refracted ray, andP b a! and P b a are respectively the angles of… … Fig. 12. 52 NAVIGATION. ar b a ~ P b a — P b a\or the difference of direction of the incident and refractedrays. A more complete statement of the law for the same twomedia is, that -—TJrnr-7 — m> a constant for these media;sin V o a or, the sines of the angles of incidence and refraction are ina…
Navigation · Nautical astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
