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" Having given the radius of an arc of any colour in the secondary rainbow, find the ratio of the sine of incidence to the sine of refraction when rays of that colour pass out of air into water. "
Solutions of the Cambridge Problems, from 1800 to 1820 - Page 687
by John Martin Frederick Wright - 1836
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The Cambridge University Calendar

University of Cambridge - Universities and colleges - 1828 - 454 pages
...north polar distance. 10. If a small pencil of parallel homogeneal rays be refracted into a sphere, and the ratio of the sine of incidence to the sine of refraction be known, to find at what angle the rays must be incident, that they may emerge parallel after any...
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