 Index of refraction. The ratio of the speed of light in air to its speed in any other medium is called the index of refraction of that medium.  Practical Physics - Page 367by Robert Andrews Millikan, Henry Gordon Gale, Willard R. Pyle - 1922 - 472 pagesFull view - About this book
 | Archibald Stanley Percival - 1899 - 422 pages
...the angle of incidence may be, the ratio — — is 8 * sinr equal to f , and this fraction expresses the ratio of the speed of light in air to its speed in water. Since the speed of light is less in dense media it is evident that the refracted rays are bent... | |
 | Robert Andrews Millikan, Henry Gordon Gale - 1906 - 534 pages
...measurement (§ 499), furnishes one of the strongest evidences of the correctness of the wave theory. 525. Index of refraction. The ratio of the speed of light in air to its speed in any medium is called the index of refraction of that medium. It is evident that the method employed in... | |
 | Charles Riborg Mann, George Ransom Twiss - 1910 - 442 pages
...the distance traveled by it in the glass in the same time. Hence the ratio of bc to ad is the same as the ratio of the speed of light in' air to its speed in the glass. Since this ratio measures the amount of the bending for any two media when light passes... | |
 | Frederick Russell Gorton - 1910 - 536 pages
...glass, etc., than in air or a vacuum (§§ 297 to 299). 9. The index of refraction of a medium expresses the ratio of the speed of light in air to its speed in that medium (§§ 300 to 302). 10. Total reflection always takes place when light travels in one medium... | |
 | Edwin James Houston, Alfred Newlin Seal - 1912 - 426 pages
...202 of the sine of the angle of incidence to the sine of the angle of refraction. This really means the ratio of the speed of light in air to its speed in the other medium. The indices of refraction of some common substances are as follows: Water 1.33 Alcohol... | |
 | Willis Eugene Tower, Charles Henry Smith, Charles Mark Turton - 1914 - 484 pages
...may be determined easily and from this the relative speed may be computed. The number that expresses the ratio of the speed of light in air to its speed in another medium is called the index of refraction of that medium. The relative speed of light, or the... | |
 | Charles Elwood Dull - 1922 - 602 pages
...prism is shown in Fig. 306. 335. Index of Refraction. The index of refraction for any substance is the ratio of the speed of light in air to its speed in that substance. The speed of light in ordinary glass is about 124,000 miles per second. Then the index... | |
 | Robert Andrews Millikan, Henry Gordon Gale - 1927 - 634 pages
...measurement ( § 418) con- / stitutes one of the great successes FIG. 400 of the wave theory. 436. Index of refraction. The ratio of the speed of light...that medium. It is evident that the method employed 405 in the last paragraph for determining the index of refraction of water can be easily applied to... | |
 | Robert Andrews Millikan, Henry Gordon Gale, Charles William Edwards - 1928 - 852 pages
...direct measurement (§ 510) constitutes one of the great successes of t piG 461 the wave theory. 529. Index of refraction. The ratio of the speed of light...any other medium is called the index of refraction * The pupil can readily perceive the truth of this statement by inspection of Fig. 461, where we have... | |
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