Elements of natural philosophy (Volume 2-3) (1850)
Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 349
340 NATURAL PHILOSOPHY. When theextraordinary-index will be aminimum. also equal to the ratio of the sine of the angle of inci-dence to that of refraction, the extraordinary ray mustalways be thrown further from the axis than the ordi-nary ray; and the extraordinary index of refraction willhave its… … Eock crystal; § 145. With rock crystal, which occurs in the form ofhexagonal prisms, terminated with six-sided pyramids,the case is just reversed; the ellipsoidal wave is prolate,its longer axis coinciding with the op-tical axis of the prism, and being equalin length to the radius of the…
Mechanics · Acoustics · Optics
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