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" It may also be defined as the sine of the angle of incidence divided by the sine of the angle of refraction, as light passes from air into the substance. "
A Treatise on Optics - Page 22
by David Brewster, Alexander Dallas Bache - 1833 - 95 pages
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The Sun

Charles Greeley Abbot - 1911 - 542 pages
...of incidence, and the angle c 7 cB the angle of refraction. A principal law of refraction is this: The sine of the angle of incidence divided by the sine of the angle of refraction is constant for a ray of a single color entering a given substance, whatever the angle at which it...
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Applied Physics for Elementary Courses

Victor Dean Hawkins - 1912 - 214 pages
...angle of refraction is the absolute index of refraction. When light passes from one medium to another, the sine of the angle of incidence divided by the sine of the angle of refraction is the relative index of refraction. This is usually written sin i — — = u sin r In general, when...
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Bulletin of the U.S. Department of Agriculture, Issues 1026-1050

United States. Department of Agriculture - 1923 - 1304 pages
...minutes or, for convenience, in what is known as the index of refraction. The index of refraction is the sine of the angle of incidence divided by the sine of the angle of refraction. The most convenient instrument for measuring this property is known as the Abb6 refractometer, a view...
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A Dictionary of applied chemistry v. 4, 1913, Volume 4

Sir Thomas Edward Thorpe - 1913 - 752 pages
...refracted rays lie in the same plane with the normal to the surface at the point of Fio. 1. incidence, the sine of the angle of incidence divided by the sine of the angle of refraction being a constant. In 1669, Bartholinus noticed that if a ray of light enters a crystal of Iceland spar,...
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Physical Laboratory Manual

Emory Leon Chaffee - 1914 - 144 pages
...is bent toward the perpendicular to the surface. For the same substances and the same colored light, the sine of the angle of incidence divided by the sine of the angle of refraction is a constant. It is called the index of refraction, and is usually denoted by the letter n. The index...
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Food Analysis: Typical Methods and the Interpretation of Results

Alpheus Grant Woodman - 1915 - 532 pages
...—. — prrro = • — * — = sin ^ sin 90 1 That is, in passing from a denser to a rarer medium, the index of refraction is equal to the sine of the angle of incidence for the border line of total reflection. The forms of refractometer most commonly employed in food...
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Food Analysis: Typical Methods and the Interpretation of Results

Alpheus Grant Woodman - 1915 - 532 pages
...sin i sin i n = . „-.i> = , = sin i sin 90 1 That is, in passing from a denser to a rarer medium, the index of refraction is equal to the sine of the angle of incidence for the border line of total reflection. The forms of refractometer most commonly employed in food...
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Optics for Photographers

Hans Harting - 1918 - 244 pages
...light in the two isotropic media I and II, and is, therefore, constant, or: III. The sine of the angle of refraction is equal to the sine of the angle of incidence, divided by a constant number. INDEX OF REFRACTION. — These constants, that is, the ratios of the velocities...
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Radiant Energy and the Ophthalmic Lens

Frederick Booth - 1921 - 272 pages
...light waves decrease as the optical density of a medium increases. The index of retras.tion equals the sine of the angle of incidence divided by the sine of the angle of refraction, thus sine of the angle of incidence Index of refraction = sine of the angle of refraction Unless more...
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Elements of Optical Mineralogy: Principles and methods

Newton Horace Winchell, Alexander Newton Winchell - 1922 - 248 pages
...occupies such a position that the index of the crystal for the extraordinary ray in the given direction is equal to the sine of the angle of incidence divided by the sine of the angle between the wave-normal and the normal to the surface. That is, if e' is the index for the extraordinary...
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