to intervenebetween the polariser and the analyser, the field may become filledwith light, coloured or white, according to the position of theinterposed film. XV.] DOUBLE REFRACTION. 501 In Fig. 189 the line AB represents a plane vertical to the paper, andcutting the paper in AB : we call this the… … usseen end-on, travelling away fromthe observers eye. Interpose athin plate of some birefringentsubstance in the path of thebeam: let the axis of this lie inthe plane CD. The beam ABis broken up by the interposedplate into two : one in whichthe plane of polarisation isparallel to CD, one in which…
Physics
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