the ve-locity of the ordinary waves tothe velocity in air, and also thecorresponding ellipsoidal wavefront as shown. At later instantsthe points b and a take up the role of secondary centers andsend out spherical and ellipsoidal wavefronts of correspondinglysmaller dimensions, and so for every… … Figure 110 216 LIGHT Here, as we see, the O-waves are not parallel to the E-waveswithin llif crystal. Tt is possible to cut or grind a piece of ealcite in such away that the optic axis is parallel to the surface, although thecrystal will not naturally split in this way. The part of figure111 to the…
Light
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