| 单词 | refractive index |
| 释义 | > as lemmasrefractive index a. Optics. index of refraction or refractive index (of a medium), the ratio between the sines of the angles of incidence and refraction of a ray of light passing from some medium (usually air) into the given medium. ΘΚΠ the world > matter > physics > electromagnetic radiation > light > refraction > [noun] > index of refraction refractive index1820 index of refraction1829 refraction index1850 1829 Nat. Philos. (Libr. Useful Knowl.) I. Optics ii. 4 The number 1.336, which regulates the refraction of water, is called its index, or exponent, or co-efficient of refraction, and some~times its refractive power. 1871 J. Tyndall Fragm. Sci. (1879) I. xi. 340 The media must possess different refractive indices. refractive index refractive index n. Physics the ratio of the velocity of light (or other electromagnetic radiation) in a standard medium (usually air or a vacuum) to its velocity in a specified medium, or (equivalently), the ratio between the sines of the angles of incidence and refraction of a ray of light passing from a standard medium into the specified medium; = index of refraction at index n. 10a. ΘΚΠ the world > matter > physics > electromagnetic radiation > light > refraction > [noun] > index of refraction refractive index1820 index of refraction1829 refraction index1850 1820 Philos. Trans. (Royal Soc.) 110 71 Dr. Brewster..has stated the refractive index of this salt at 1.515. 1839 G. Bird Elements Nat. Philos. 394 The refractive indices of the different refracting structures of the eye. 1902 H. A. Miers Mineral. ii. 443 Brewster..found it [sc. a mineral] to have the low refractive index 1·2. 1954 J. F. Kirkaldy Gen. Princ. Geol. xi. 162 The Becke test is a quick method of determining whether the refractive index of a mineral is greater or less than that of balsam. 1999 J. Hecht City of Light x. 127 Graded-index fibers work differently because the refractive index varies with the distance from the center of the fiber. < as lemmas |
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