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" It may also be defined as the sine of the angle of incidence divided by the sine of the angle of refraction, as light passes from air into the substance. "
A Treatise on Optics - Page 22
by David Brewster, Alexander Dallas Bache - 1833 - 95 pages
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Cyclopadic Science Simplified

John Henry Pepper - 1869 - 722 pages
...but since BAF is known, the angle of refraction BRN is also known ; and the angle of incidence HRB being found by the preceding methods, we may determine...incidence divided by the sine of the angle of refraction. By this method we may readily measure the refractive power of all bodies. If the body be solid, it...
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Notes of a Course of Nine Lectures on Light: Delivered at the Royal ...

John Tyndall - 1870 - 110 pages
...the line np will be the sine of the angle of refraction. 117. Hence the all-important optical law — The sine of the angle of incidence divided by the sine of the angle of refraction is a constant quantity. However these angles may vary in size, this bond of relationship is never severed....
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Notes of a Course of Nine Lectures on Light: Delivered at the Royal ...

John Tyndall - 1870 - 92 pages
...the line np will be the sine of the angle of refraction. 117. Hence the all-important optical law — The sine, of the angle of incidence divided by the sine of the angle of refraction is a constant quantity. However these angles may vary in size, this bond of relationship is never severed....
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LIGHT AND ELECTRICITY: NOTES OF TWO COURSES OF LECTURES BEFORE THE ROYAL ...

JOHN TYNDALL, L.L.D., F.R.S. - 1871 - 204 pages
...line np will be the sine of the angle of refraction. 117. Hence the/ill-important optical law—The sine of the angle of incidence divided by the sine of the angle of refraction is a constant quantity. However these angles may vary in size, this bond of relationship is never severed....
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Light and Electricity: Notes of Two Courses of Lectures Before the Royal ...

John Tyndall - 1874 - 216 pages
...the line np will be the sine of the angle of refraction. 117. Hence the ill-important optical law — The sine of the angle of incidence divided by the sine of the angle of refraction is a constant quantity. However these angles may vary in size, this bond of relationship is never severed....
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Vision

Christopher Smith Fenner - 1875 - 360 pages
...sine of the angle of incidence, while np will be the sine of the angle of refraction ; hence, the law. The sine of the angle of incidence, divided by the sine of the angle of refraction, is a constant quantity, which quantity invariably determines the index of refraction. Rays passing...
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A Lecture on Lenses

Joseph Zentmayer - 1876 - 23 pages
...divide o'm' by n'p', we will have in both cases the same quotient, or, as it is generally expressed : the sine of the angle of incidence divided by the sine of the angle of refraction is a constant, whatever the angle of incidence may be. This constant quotient is called the index of...
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Cyclopædic science simplified

John Henry Pepper - 1877 - 766 pages
...but since BAF is known, the angle of refraction BRN is also known ; and the angle of incidence HRB being found by the preceding methods, we may determine...incidence divided by the sine of the angle of refraction. By this method we may readily measure the refractive power of all bodies. If the body be solid, it...
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Principles of Chemical Philosophy

Josiah Parsons Cooke (Jr.) - 1881 - 648 pages
...refraction, we readily deduce another value for the index of refraction ; and it is usually denned as the sine of the angle of incidence divided by the sine of the angle of refraction. Moreover, according to the well-known law of refraction, not only is this ratio constant for any incidence,...
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Sound, light and heat

Alfonzo Gardiner - 1881 - 214 pages
...The sine of the angle of incidence bean a fixed proportion to the sine of the angle of refraction; or the sine of the angle of incidence, divided by the sine of the angle of refraction, is (for the same two media) always a constant quantity (ie, the same number^, which is called the "...
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