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" When a ray of light passes from one medium to another, it is refracted so that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the velocities in the two media. "
Manual of optics, by J.A. Galbraith and S. Haughton - Page 18
by Joseph Allen Galbraith - 1854
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Practical Methods in Microscopy

Charles Herbert Clark - Microscopy - 1896 - 261 pages
...it has been found by experimental demonstration that, as long as the two media remain the same, the ratio of the sine of the angle of incidence to the sine of the angle of refraction This ratio -=T=- is called the Index of Refracis constant. PR tion. It is usually expressed...
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Diseases of the Eye

Nathaniel L. Macbride - Eye - 1897 - 310 pages
...remembered that Snell's law is only applicable to homogeneous substances. The number which expresses the ratio of the sine of the angle of incidence to the...angle of refraction is called the Index of Refraction. This is, in the case of air and glass, f, or, as it is most always expressed, 1.50. In the case of...
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The Outlines of Physics: An Elementary Text-book

Edward Leamington Nichols - Physics - 1897 - 452 pages
...The law of its change of direction follows a fixed law ; viz. : 343. THE LAW OP REFRACTION. — The ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant. The law may be expressed thus, sin i = n. sinr The quantity n in the above equation is called...
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Theory of Physics

Joseph Sweetman Ames - Physics - 1897 - 513 pages
...refracted wave-fronts and to the plane surface all lie in one plane, viz. the plane of incidence. 2. The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant for a given form of matter and waves of a definite wave-number; it is entirely independent...
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The Microscope: Its History, Construction, and Application, Being a Familiar ...

Jabez Hogg - Microscope and microscopy - 1898 - 704 pages
...light also of the same kind, then it is referred to as the law of sines. Indices of Refraction. The ratio of the sine of the angle of incidence to the sine of the angle of refraction, when a ray passes from one medinm to another is termed the relative index of refraction....
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Chandler's Encyclopedia: An Epitome of Universal Knowledge ...

William Henry Chandler - Encyclopedias and dictionaries - 1898
...works devoted to special subjects are almost innumerable. IXDEX— INDIANS Index of Refraction. Rates of the sine of the angle of incidence to the sine of the angle of refraction. See REFRACTION. India. Country of s. Asia, a dependency of Great Britain. It consists mainly...
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A Text-book of Physics

William Watson - Physics - 1899 - 918 pages
...then in general there will be two refracted rays, but while one of them obeys Snell's law in that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant, whatever the direction of the incident ray, for the other ray this ratio is different for...
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Skiascopy: A Treatise on the Shadow Test in Its Practical Application to the ...

George Adelmer Rogers - Retinoscopy - 1899 - 213 pages
...potential foci of the neutral pencils are posterior to the retina. Index. — (i") Index of Refraction. The ratio of the sine of the angle of incidence to the sine of the angle of refraction (alb). (2) Index of Resistance. The ratio of the resistance of a medium to the resistance...
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A Manual of Elementary Practical Physics for High Schools

Julius Hortvet - Physics - 1899 - 255 pages
...CF = CE' ED But pr> = the index of refraction. Hence the index of refraction is defined also as the ratio of the sine of the angle of incidence to the sine of the angle of refraction. The index of refraction is different for rays of different colors, increasing from the...
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A Brief Course in General Physics, Experimental and Applied

George Arthur Hoadley - Physics - 1900 - 463 pages
...the angles of incidence and refraction respectively if we consider the radius BGr to be unity. The ratio of the sine of the angle of incidence to the...angle of refraction is called the index of refraction. In Fig. 429 the index of refraction is _ • FGr HK. 469. The Laws of Refraction. I. When a ray of...
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