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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

## Abstracts of the Papers Printed in the Philosophical Transactions ..., Volume 1

...elementary, yet lead to results of a less obvious nature. They are as follows; — -1. In all refractions the ratio of the sine of the angle of incidence to the sine of the angle of refraction, is constant. 2. If between two refracting mediums a third medium, terminated by parallel svwfocefe, Y><t...

## An Elementary Course of Mathematics: Designed Principally for Students of ...

Harvey Goodwin - Mathematics - 1849 - 528 pages
...surface, the distance of the geometrical focus from the surface is to its distance from the centre, as the sine of the angle of incidence to the sine of the angle of refraction. There will be four different cases, 1. A concave surface; the rays passing from a rarer...

## Hand-books of Natural Philosophy and Astronomy: Mechanics. Hydrostatics ...

Dionysius Lardner - Astronomy - 1851
...and the refracted ray through glass. If the semi-cylinder AM u, instead of glass, be water, then the ratio of the sine of the angle of incidence to the sine of the angle of refraction will be 4 to 3, so that we shall have I N4 _ R'P'~3' i" N" 4 R"P" 3' and so on. Thus each...

## A Treatise on Trigonometry, Plane and Spherical: With Its Application to ...

Charles William Hackley - Trigonometry - 1851 - 372 pages
...refra'ction being 35° 11', to find the index of refraction. NOTE. — The index of refraction is the ratio of the sine of the angle of incidence to the sine of the angle of refraction. Ant. -8. • The force down an inclined plane is to the force of gravity, as the height...

## An Introduction to the Elements of Practical Astronomy

James R. Christie - Astronomical instruments - 1853 - 118 pages
...the effect is known by the term " refraction." The angle MBL is the " angle of refraction," and the ratio of the sine of the angle of incidence to the sine of the angle of refraction is found to be constantly the same for the same substance, when the medium through which the ray originally...

## Optics

Dionysius Lardner - Optics - 1856 - 432 pages
...refraction, both of the extraordinary and ordinary rays, will be in the plane of the same meridian ; but the ratio of the sine of the angle of incidence to the sine of the angle of extraordinary refraction will not in this case be constant. I92 right angles to the optical axis us,...

## Aid to Teachers and Students in Natural Philosophy: Being the "key" to Dr ...

Frank Grant Johnson - Physics - 1856 - 60 pages
...piece of money, to llustrate refraction of light. FIG. 18. Illustrates the law of refraction, that the ratio of the sine of the angle of incidence to the sine of the anglo of refraction, is constant. FIG. 19. (On the left.) Shows a ray of light refracted by a triangular...

## A Hand-book of Optics

Dionysius Lardner - Optics - 1858 - 279 pages
...and the refracted ray through glass. If the semi-cylinder AMB, instead of glass, be water, then the ratio of the sine of the angle of incidence to the sine of the angle of refraction will be 4 to 3, so that we shall have I N_4 RP~3' !'# 4 R'p'~3' i" N" _ 4 R"P"~3' and so...