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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 Eye

Edward E. Gibbons - 1904 - 498 pages
...refracting medium to the passage of light. In other words the index of refraction of a substance is the sine of the angle of incidence divided by the sine of the angle of refraction. The law is illustrated in the following way : Let M be a refracting medium ; abc a train of plane waves...
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Physics

Charles Riborg Mann, George Ransom Twiss - 1905 - 488 pages
...sin r, whence ac ac b_c smi = ac = be Therefore [cf tion (18)] n= £EJ (19) sin r ad ad sin r ac Thus the index of refraction is -equal to the sine of the...incidence divided by the sine of the angle of refraction. Since these angles are easily measured, this ratio is more convenient to use than that of the velocities....
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Forty Lessons in Physics

Lynn Banks McMullen - 1906 - 474 pages
...(Fig. 206). The value of the critical angle may be found as follows: The index of refraction equals the sine of the angle of incidence divided by the sine of the angle of refraction, equals, in this case, the sine of the critical angle divided by the sine of 90° (which is unity)....
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The Microscope: An Introduction to Microscopic Methods and to Histology

Simon Henry Gage - 1908 - 376 pages
...the rarer medium and that taken by the ray in the denser medium. The relationship is expressed thus : Sine of the angle of incidence divided by the sine of the angle of refraction equals the indexofrefraction. In the figures, Sin CBN' of refraction. Worked out completelv in Fig....
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Physical Laboratory Manual: For Secondary Schools

Charles Francis Adams - 1909 - 204 pages
...in this equation, we have Z i = 1.D + £ A, or » = K-*> + .4)- (2) Since the index of refraction = sine of the angle of incidence divided by the sine of the angle of refraction, . sin . • Index ot retraction = sin ^ A The sines of these angles can be found in Table 13, Appendix,...
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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 - 1298 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 - 748 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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