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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

## Elements of Natural Philosophy, Volumes 2-3

...It is the ratio of the velocity of the incident to that of the deviated light, which is equal to the ratio of the sine of the angle of incidence to the sine of the angle of refraction or of reflexion, according as m is positive or minus unity. The numerical value of m, has...

## Photographic Optics: Including the Description of Lenses and Enlarging ...

Désiré van Monckhoven - Electronic book - 1867 - 259 pages
...ray, the refracted ray, and the normal, are all in the same plane. 2nd. For the same two media, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant, whatever may be the angle of incidence. This law has received the name of " the Law of Descartes."...

## A course of natural philosophy, containing the elements of mechanics ...

Richard Wormell - 1871
...perpendicular to oc, then whatever the angle of incidence may be, the ratio — remains the same. BT The ratio of the sine of the angle of incidence to the sine of the angle of refraction is termed the refractive index for the given media. 37. Having given the direction of the incident ray...

## Natural Philosophy: For the Use of School, Academies and Private Students ...

David Ames Wells - 1871
...observed with equal constancy. The quotient found by dividing the sine of the angle of incidence by the sine of the angle of refraction, is called the index of refraction. As different bodies have different refractive powers, they will present different indices, but in tho...

## elementary treatise on nautral philosophy

a. privat deschanel - 1873
...the course of a returning ray is the same as that of a direct ray. 724. 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 medium into another, is called the relative index of refraction...

## Elementary Treatise on Natural Philosophy: Sound and light

Augustin Privat-Deschanel - Physics - 1873 - 1068 pages
...course of a returning ray is the same as that of a direct ray. 724. 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 medium into another, is called the relative index of refraction...

## Report

...Prof. Purser, on the moment, made out nn analytical investigation which depended on the proportionality of the sine of the angle of incidence to the sine of the. angle of refraction holding good for infiuitely thin laminie differing infinitely little in density, und holding...

## Report of the Annual Meeting

...Prof. Purser, on the moment, made out an analytical investigation which depended on the proportionality of the sine of the angle of incidence to the sine of the angle of refraction holding good for infinitely thin laminfe differing infinitely little in density, and holding...