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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

Forty Lessons in Physics

Lynn Banks McMullen - Physics - 1906 - 452 pages
...discovered the following law of refraction, whose mathematical proof is given under Fig. 202 : The ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant for the same two media, whatever the angle of incidence. TRACING RAYS FROM ONE MEDIUM TO ANOTHER....

A Text-book of Physics: For Use in Secondary Schools

Joseph Albertus Culler - Physics - 1906 - 420 pages
...light passes from a denser to a rarer medium. 275. Index of Refraction. The index of refraction, is the ratio of the sine of the angle of incidence to the sine of the angle of refraction. Let AO, Fig. 219, be a ray of light passing from air, say, into water, nn' is the perpendicular,...

Physical Measurements in Sound, Light, Magnetism and Electricity

Ralph S. Minor - Physical measurements - 1906 - 200 pages
...p. 480. The refractive index 'of a substance for light of a given wave-length may be denned as the ratio of the sine of the angle of incidence to the sine of the angle of refraction, when the substance is the receiving medium. The beam of light is thought of as traveling...

The Elements of Physics

Silas Ellsworth Coleman - Physics - 1906 - 439 pages
...their indices are equal, light will pass from one to the other at any angle without deviation. The ratio of the sine of the angle of incidence to the sine of the angle of refraction when light passes from any medium into another is called the relative index of refraction...

Forty Lessons in Physics

Lynn Banks McMullen - Physics - 1906 - 452 pages
...of using the ratio of the speeds in making a diagram, it is easier to use the equal ratio — that of the sine of the angle of incidence to the sine of the angle of refraction — and to construct the angle of refraction so that its sine shall bear the required ratio...

Practical Methods in Microscopy

Charles Herbert Clark - Microscope and microscopy - 1907 - 219 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 is constant. This ratio - is called the Index of RefracPR tion. It is usually expressed decimally. If...

ELements of Physics

George Arthur Hoadley - Physics - 1908 - 464 pages
...normal DE; then these lines are the sines of the angles of incidence and refraction respectively. The ratio of the sine of the angle of incidence to the...angle of refraction is called the index of refraction. In T?(3 Fig. 421 the index of refraction is jff>- This ratio is the same as the ratio of the velocities...

Physics for Secondary Schools

Charles Francis Adams - Physics - 1908 - 490 pages
...trigonometry as'the sine of the angle AoP. Likewise LF the ratio — is the sine of the angle EoD. r The ratio of the sine of the angle of incidence to the...of the angle of refraction is called the index of reBC ...-,, - BC LF BC fraction of the two media. — - -. • = -=— rr LF is the index of refraction...