Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 742
ed waves are also plane and may be foundas follows. Let AB (Fig. 474) represent the surface of auniaxial crystal and p C the direction of the optic axis, takenfor simplicity in the plane of the paper. Also, let pp^p^ bethe plane incident wave perpendicular to the plane of thepaper. While the… … Fig. 473. has reached Ce. Likewise, in the same time, let the disturb-ance in the wave-front at pt have moved to p\ in the air andto o and e in thecrystal. Then, byHuyghenss principlethe new wave-frontscorresponding to pp2will be the envelopesof the elementary dis-turbances, which inthis case are…
Physics
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