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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

## The Universal Cyclopaedia, Volume 10

...the direction of either ray in a double refracting medium, see POLARIZATION. Index of Refraction, — The constant ratio of the sine of the angle of incidence to the sine of the angle of refraction when a ray of homogeneous light passes through the bounding surface between two media. Thus...

## A Treatise on Geometrical Optics

Robert Alfred Herman - Geometrical optics - 1900 - 344 pages
...The two parts of the ray are in the same plane with the normal and on opposite sides of it, (ii) The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant, depending on the media, and on the nature of the light. The relation between the sines...

## A First Book of the Lens: An Elementary Treatise on the Action and Use of ...

C. Welborne Piper - Photographic lenses - 1901 - 170 pages
...refractive index from air into glass ; or, to put the relationship of the angles in another form, the ratio of the sine of the angle of incidence to the .sine of the angle of refraction equals the relative refractive index. This is called the law of sines. The,course of a ray...

## Light: An Elementary Text-book, Theoretical and Practical for Colleges and ...

Sir Richard Glazebrook - Heat - 1902 - 213 pages
...REFRACTION AT PLANE SURFACES. 53 for two given media the value of the ratio sin \$/sin <j>', ie the ratio of the sine of the angle of incidence to the sine of the angle of refraction was constant for all angles of incidence. In Table I. are tabulated in the first two columns...

## Anomalies and Diseases of the Eye

Flavel Benjamin Tiffany - Eye - 1902 - 619 pages
...other as A : A or as 4 :3. The quotient t, obtained by dividing the sine of the angle of incidence by the sine of the angle of refraction, is called the index of refraction, I being the index of refraction of light in passing from air into water. In passing from air into glass,...

## A Text Book of Organic Chemistry

William Albert Noyes - Chemistry, Organic - 1903 - 534 pages
...meant the constant calculated by the formula : M(rf - 1) M = Molecular weight. « = Index of refraction (ratio of the sine of the angle of incidence to the sine of the angle of refraction, or ratio of the velocity of light in air to that in the substance). d = Density or specific...

## A Manual of Elementary Practical Physics

Julius Hortvet - Physics - 1903 - 276 pages
...T?I~) and -=r^ = the index of refraction. r K 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...

## Physical Laboratory Manual for Secondary Schools

Silas Ellsworth Coleman - Physics - 1903 - 234 pages
...their sines. 42. Index of Refraction. — The index of refraction of a substance is defined as the ratio of the sine of the angle of incidence to the sine of the angle of refraction when light enters the substance from a vacuum. That is : — AT) rjj) Index of refraction...