Elements of natural philosophy (Volume 2-3) . as the plane of reflexion there coincides with, or is perpendicular to, the plane of first reflexion. But the other rays composing the cone will be modified in their passage through the crystal, and the changes which they will undergo will depend on their inclination to the optical axis, and on the position of the principal section with respect to the plane of pri- other rays win ... -i . ,. be modified. nntive polarization. Let the circle represent the sec-tion of the emergent cone of raysmade by the surface A B of thecrystal; and let MM and JVJ^\
Elements of natural philosophy (Volume 2-3) . as the plane of reflexion there coincides with, or is perpendicular to, the plane of first reflexion. But the other rays composing the cone will be modified in their passage through the crystal, and the changes which they will undergo will depend on their inclination to the optical axis, and on the position of the principal section with respect to the plane of pri- other rays win ... -i . ,. be modified. nntive polarization. Let the circle represent the sec-tion of the emergent cone of raysmade by the surface A B of thecrystal; and let MM and JVJ^\be two lines drawn through itscentre at right angles, being theintersection of the same surfaceby the plane of primitive polariza-tion, and by the perpendicularplane, respectively. Now, the vi-brations which emerge at anypoint of these lines will not be resolved into two within the u „ 1 Vibrations that crystal, nor will their places of polarization, that is, of win not bovibration, be altered; because the principal section 0fresolved;. Section of theemergent pencilby the face ofthe crystal; Fig. 109.
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