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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. "
Sir Isaac Newton's Two Treatises: Of the Quadrature of Curves and Analysis ... - Page 270
by Sir Isaac Newton - 1745 - 479 pages
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Fownes' Manual of Chemistry, Theoretical and Practical

George Fownes - Chemistry - 1878 - 1003 pages
...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...
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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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Introductory Course of Natural Philosophy for the Use of High Schools and ...

Adolphe Ganot - Physics - 1881 - 530 pages
...indices of refraction for the two media. When a ray passes from a vacuum into any medium, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is always greater than unity, and is called the absolute index of refraction, or simply...
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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
...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...
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A Text-book on Physics: Being a Short and Complete Course Based Upon the ...

Henry Kiddle - Physics - 1883 - 272 pages
...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 sine of the angle of refraction is called the index of refrnction.\ It varies with the medinm, * " To account for refraction,...
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The chemistry of light and photography in its application to art, science ...

Hermann Wilhelm Vogel - 1883
...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...
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New theorie of matter and of force

William Barlow (of Muswell Hill.) - 1885
...Again, since the ratio of the velocity in the incident waves to the velocity in the refracted waves is that of the sine of the angle of incidence to the sine of the angle of refraction, y\ TJ« and jj-jj = sine of the angle of incidence, f1 H and jTy- = sine of the angle of...
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Physical Arithmetic

Alexander Macfarlane - Mathematics - 1885 - 357 pages
...into another medium B, it is bent out of its former straight course in such a manner that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant. This physical ratio is expressed by /t L parallel per L along in A — L parallel...
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Physical Arithmetic

Alexander Macfarlane - Mathematics - 1885 - 357 pages
...medium B, it is bent out of its former straight course in such a manner that the ratio of the sino of the angle of incidence to the sine of the angle of refraction is constant. This physical ratio is expressed by p. L parallel per L along in A — L parallel...
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