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الكتب الكتب 1 - 10 من 135 في... that the ratio of the sines of the angles of incidence and refraction is constant....
" ... that the ratio of the sines of the angles of incidence and refraction is constant for refraction in the same medium, was effected by Snell and Descartes. "
The Family Library (Harper). - الصفحة 78
1845
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The Present State of the Republick of Letters

1734
...fucb a manner, that they may all converge to the fame Point in its Axis, or unite in one Focus nearly, The Ratio of the Sines of the Angles of Incidence and Refraction of the fever al Sorts of Rays being refpeftively given, and allowed conflant and immutable, according...
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A Plain Elementary and Practical System of Natural Experimental Philosophy ...

John Ewing - 1809 - عدد الصفحات: 538
...but a point. Let x=the sine of the angle of incidence, and therefore VI — xx=its cosine, r=l; put the ratio of the sines of the angles of incidence and refraction, as 1 : p, then 1 : p : : x : px=the sine of the angle of refraction; and Vl — pjx"= its cosine. The...
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A Treatise on New Philosophical Instruments, for Various Purposes in the ...

Sir David Brewster - 1813 - عدد الصفحات: 427
...and the sun's altitude, observed at the same time, he found the angle of refraction, and consequently the ratio of the sines of the angles of incidence and refraction, for the mean refrangible rays. The celebrated Euler suggested a method of measuring the refractive...
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The American Journal of Science and Arts

1861
...fathom-intervals are exaggerated nearly in the ratio of 6 to 8 or 3 to 4 : — that is, sensibly in the ratio of the sines of the angles of incidence and refraction for water. This is only true for small angles of incidence, that is, for the lower fathoms ; for, in...
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History of the Inductive Sciences: From the Earliest to the ..., المجلد 1

William Whewell - 1837
...difference of less than half a degree each way. When we consider how simple the law of refraction is, (that the ratio of the sines of the angles of incidence and refraction is constant for the same medium,) it appears strange that a person attempting 5 Optica, p. 411. " LUK...
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The elements of physics

Thomas Webster - 1837
...one medium to another, the change which takes place in if" direction is expressed by saying, that ' the ratio of the sines of the angles of incidence and refraction is invariable for the same medium.' This we shall endeavour to explain. Let a vessel which is a hemisphere...
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The Edinburgh Review: Or Critical Journal, المجلد 66

1838
...difference of less than half a degree each way. ' When we consider how simple the law of refraction is (that the ratio of the sines of the angles of incidence and refraction is constant for the same medium), it appears strange that a person attempting to discover it, and drawing...
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A Rudimentary Treatise on the History, Construction, and ..., الجزء 3

Alan Stevenson - 1850 - عدد الصفحات: 204
...assumes the form * The truth of the first of these equations (sin £ = m . sin 7) which merely expresses the ratio of the sines of the angles of incidence and refraction is obvious ; but owing to the great number of small angles about C, a little consideration may be required...
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Hand-books of Natural Philosophy and Astronomy: Mechanics. Hydrostatics ...

Dionysius Lardner - 1851
...each transparent medium has its own particular refracting power, but for the same transparent medium the ratio of the sines of the angles of incidence and refraction is always the same. 980. Index of refraction. — The number which thus expresses the ratio of the...
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An Elementary Treatise on Optics

Isaac Wilber Jackson - 1852 - عدد الصفحات: 261
...fundamental laws of simple refraction are two. $ 1. The planes of incidence and refraction coincide. § 2. The ratio of the sines of the angles of incidence and refraction is constant for the same media. Let NP'N' [Fig. 29] represent a vertical section of a hemispherical...
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