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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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Natural Philosophy for Beginners: With Numerous Examples, Part 2

Isaac Todhunter - Physics - 1877
...the law is called for brevity the law of sines. 229. The number which expresses the fixed proportion of the sine of the angle of incidence to the sine of the angle of refraction is different in different media. 4 For water it is about -; so that the sine of the angle ION o 4 is -...
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Elementary Text-book of Physics

Joseph David Everett - Physics - 1878 - 314 pages
...case of water and air is \. The general law of refraction may be stated in the following words : the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant when the two media are given, and is called the index of refraction from the first medium...
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Fownes' Manual of Chemistry, Theoretical and Practical

George Fownes - Chemistry - 1878 - 1003 pages
...has been explained that the' index of refraction of any transparent substance, that is to say, the ratio of the sine of the angle of incidence to the sine of the angle of refraction, is a constant quantity, so long as the density of the substance remains constant: — Bin i _ n sin г...
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The Human Eye; Its Optical Construction Popularly Explained

Robert Ellis Dudgeon - Eye - 1878 - 92 pages
...the angle of refraction as the index of refraction of the lens is to i. Thus if the lens be of water, the sine of the angle of incidence to the sine of the angle of refraction will be as i • 3 to i ; if of glass, as i • 5 to i ; if of diamond, as 2 -4 to I, and...
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Elementary Physics

Elroy McKendree Avery - Physics - 1878 - 317 pages
...of the angle of refraction. The quotient arising from dividing the sine of the angle of incidence by the sine of the angle of refraction is called the index of refraction for the two media. It is evident that the greater the refractive power of the substance, the less the...
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Sound and light

Augustin Privat-Deschanel - Physics - 1881
...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...
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Water and Its Teachings in Chemistry, Physics, and Physiography: A ...

Conwy Lloyd Morgan - Water - 1882 - 216 pages
...towards this perpendicular. 1541. In water at whatever oblique angle the ray strikes the surface, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is 1.336. In other substances the ratio is different. 1542. If instead of passing from the less to the...
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A Text-book on Physics: Being a Short and Complete Course Based Upon the ...

Henry Kiddle - Physics - 1883 - 272 pages
...being greater or less than the former, according to the relative density of the refracting medinm. The ratio of the sine of the angle of incidence to the...of the angle of refraction is called the index of refrnction.\ It varies with the medinm, * " To account for refraction, let us for the sake of Bimplicity...
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The chemistry of light and photography in its application to art, science ...

Hermann Wilhelm Vogel - 1883
...what mathematicians call the sines of the angles. Thus ad is the sine of i, and bf the sine of r. The ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant. This ratio is, when light leaves air for water, 4 to 3 ; that is, the sine bf is f times...
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A text-book on the elements of physics for high schools and academies

Alfred Payson Gage - Physics - 1885 - 439 pages
...boundary plane ; if from a denser into a rarer medium, it is refracted from the perpendicular. The ratio of the sine of the angle of incidence to the...angle of refraction is called the index of refraction, and is the same as the ratio of the velocity of the incident to that of the refracted light. When a...
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