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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

## The Elements of Astronomy, Physical and Geometrical, Volume 1

...the Dioptric denfity of the Atmofphere were known in any given diftance from the Earth, or the ratio of the Sine of the Angle of incidence to the Sine of the refraeted Angle, in the paflage of a Ray thro' its Surface concentric with the Earth, whofe diftance...

## Philosophical Transactions of the Royal Society of London, Volumes 31-33

Meteorology - 1723
...the refracted Angle ; fo that IH being perpendicular to FH and IG perpendicular to FG, IH is to IG as the Sine of the Angle of Incidence to the Sine of the refracted Angle, and the Ratio of IH to IG is given, as likewife the Ratio of IK to I G. Therefore...

## A Compleat System of General Geography: Expalining the Nature and Properties ...

Bernhardus Varenius - Geography - 1734 - 898 pages
...Refraftkn in it of a Star in a certain Altitude, to find tb« Law of Refraftion, or the Proportion of the Sine of the Angle of Incidence^ to the Sine of the re~ f ratted Angle ; or to find the tbicknefi of the Air by that Refrattion. THE Altitude of the Air...

## A Compendious System of Natural Philosophy: With Notes, Containing ..., Volume 1

John Rowning - Astronomy - 1744
...Degree of fntenfenefs, whatever be the Velocity they move with ; It may be demonjtrated, that the Ratio of the Sine of the Angle of Incidence to the Sine of ibe Angle of RefratJian, will be given. But in Refraliion of Light, the Ratio of thofe Sines is given...

## A Compendious System of Natural Philosophy: With Notes, Containing the ...

John Rowning - Astronomy - 1758 - 45 pages
...Degree of Intenfenefs, whatever be the Velocity they move with*, it may he demenjlraied, that the Ratio of the Sine of the Angle of Incidence to the Sine of the Angle of Refraftion, will be given. But in Refraflion cf Light, the Ratio of thofe Sines is given in Fail ;...

## A Plain Elementary and Practical System of Natural Experimental Philosophy ...

John Ewing - Astronomy - 1809 - 538 pages
...velocity of the ray of light, after it enters a denser medium, is to its velocity before it enters it, as the sine of the angle of incidence to the sine of the angle of refraction. For the greater that the attractive force of the denser medium is, the more will the ray...

## Encyclopaedia Britannica; Or A Dictionary of Arts, Sciences, and ..., Volume 15

...the angle EFK ; that is, as the sine of the angle ЛВН to the sine of the angle FEI; that is, as the sine of the angle of incidence to the sine of the angle of refraction. By the same reasoning it will appear that light, moving in the direction and with the velocity...

## Outlines of Physiology. With an Appendix, Containing Heads of Lectures on ...

William Pulteney Alison - Physiology - 1831 - 452 pages
...the surface of the lens, — and by the degree of its refractive power, that is, by the proportion of the sine of the angle of incidence, to the sine of the angle of refraction, of all rays that enter it from air. Now, these three conditions are the same in regard...