Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 743
dicularP, to the optic axis (Fig. 475), the extraordinary rayis both perpendicular to itsP wave-front and in the planeof incidence. For this casethe velocity of the extraor-dinary wave bears a constantratio to the velocity in air forall angles of incidence, itsvalue being known as the extraordinary… … Those crystals in which ne > n0 are called positive, and thosein which ne < nQ are called negative. In the former, of whichice and quartz are examples, the ellipsoid lies within the PILE OF PLATES. 733 sphere ; in the latter, as for example in Iceland spar and tour-maline, the ellipsoid lies…
Physics
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