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

Charles William Hackley - Trigonometry - 1851 - 372 pages
...the zenith enter the atmosphere perpendicularly) in accordance with the optical law that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant. At the end of the volume we have given a table of refractions containing the... ## Hand-books of Natural Philosophy and Astronomy: Mechanics. Hydrostatics ...

Dionysius Lardner - Astronomy - 1851
...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... ## An Introduction to the Elements of Practical Astronomy

James R. Christie - Astronomical instruments - 1853 - 118 pages
...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... ## Manual of optics, by J.A. Galbraith and S. Haughton

Joseph Allen Galbraith - 1854
...related to each other, that their sines are in a constant ratio. DEFINITION. — The constant ratio of the sine of the angle of incidence to the sine of the angle of refraction is called the index of refraction. Every different transparent body in nature has its own... ## Optics

Dionysius Lardner - Optics - 1856 - 432 pages
...refraction is always the same. 94. Index of refraction. — The number which thus expresses the ratio of the sine of the angle of incidence to the sine of the angle of refraction, and which in the case of air and glass is f or I '5, and in the case of air and water is... ## Aid to Teachers and Students in Natural Philosophy: Being the "key" to Dr ...

Frank Grant Johnson - Physics - 1856 - 60 pages
...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
...refraction is always the same. 980. Index of refraction. — The number which thus expresses the ratio of the sine of the angle of incidence to the sine of the angle of refraction, and which in the case of air and glass is J or 1-5, and in the case of air and water is... ## A Treatise on Optics

Stephen Parkinson - Optics - 1859 - 311 pages
...refracting angles, he ascertained that for a ray corresponding to any one of the fixed lines, the ratio of the sine of the angle of incidence to the sine of the angle of refraction was invariable,— thus affording the strongest corroboration of the law of refraction (Art.... 