 | David Gregory - Astronomy - 1715 - 634 pages
...SCHOLIUM. If 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... | |
 | Bernhardus Varenius - Geography - 1734 - 562 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... | |
 | Isaac Newton - Calculus - 1745 - 524 pages
...= x, CD =3 : whence becaufe GE, EB, EF are proportional, you have EB = </zx: moreover, if a exprefs the Ratio of the Sine of the Angle of Incidence to the Sine of the Angle of Refraction, then BD = az : likewife from the fimilar Triangles DBE, DGH, you have DB (az)... | |
 | Mary Somerville - Astronomy - 1831 - 710 pages
...refraction of light ; and supposing the velocity of a ray of light to be less in the denser medium, he found that the ratio of the sine of the angle of incidence to that of the angle of refraction, is constant and greater than unity. Newton however proved by the attraction... | |
 | William Pulteney Alison - Human physiology - 1831 - 538 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... | |
 | Royal Society (Great Britain) - Electronic journals - 1832 - 550 pages
...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... | |
 | Royal Society (Great Britain) - Electronic journals - 1832 - 564 pages
...elementary, yet lead to results of a less obvious nature. rliiey 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... | |
 | Charles William Hackley - Trigonometry - 1851 - 524 pages
...from objects in 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... | |
 | Dionysius Lardner - Astronomy - 1851 - 804 pages
...incidence and 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... | |
 | Charles William Hackley - Trigonometry - 1851 - 536 pages
...of refraction being 35o 11', to find the index of refraction. NOTE. — The index of refraction ia the ratio of the sine of the angle of incidence to the sine of the angle of refraction. Ans. *8. • The force down an inclined plane is to the force of gravity,... | |
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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. 
