Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 468
ach other. Light is polarized by transmission and by reflection.We have already, when we were discussing the principleinvolved in the double-iraage micrometer, seen how acrystal of Iceland spar divides a ray into two parts atthe point of incidence. Now these two rays are ojyjyo-sitely 2)ol(iriz€d,… … Fig. 204. —Diagram showing the Path of the Ordinary and Extraordiuar} Rayin Crystals of Iceland Spar. therefore two rays, one called the ordinary ray, andthe other the extraordinary ray. Fig. 204 shows a rayof light, s I, incident on the first crystal at r; it is thendivided up into the ordinary…
Astronomy · Telescopes
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