Elements of natural philosophy (Volume 2-3) . Fiff. ELEMENTS OF OPTICS. 345 a, the angle made by the principal sections of the crys- Notation;tals; 00, the intensity of the ordinarily refracted wave;and Oe, that of the wave refracted according to the ex-traordinary law. Removing the wafer from e, and calling Ee and E0the intensities of the extraordinary and ordinary wavesinto which the wave moving on Pe is separated by thesecond crystal, and B its intensity on leaving the firstcrystal, we shall, in like manner, have -&» ~~ -K • ( )s2 a J Components of V-LJ-^j the extraordinaryE0 = B . Si
Elements of natural philosophy (Volume 2-3) . Fiff. ELEMENTS OF OPTICS. 345 a, the angle made by the principal sections of the crys- Notation;tals; 00, the intensity of the ordinarily refracted wave;and Oe, that of the wave refracted according to the ex-traordinary law. Removing the wafer from e, and calling Ee and E0the intensities of the extraordinary and ordinary wavesinto which the wave moving on Pe is separated by thesecond crystal, and B its intensity on leaving the firstcrystal, we shall, in like manner, have -&» ~~ -K • ( )s2 a J Components of V-LJ-^j the extraordinaryE0 = B . Sin2 a ) wave; Taking the sum of the four emergent waves, there willresult, 0. + Oe + Ee + E0 = A + B. Sumof thefour u c emergent waves. The waves 00 and <9e, in* Equations (113), are alwaysfound to be polarized, the former in the plane of princi-pal section of the second crystal, the latter in a plane atright angles to it; and the same remark being applica-ble to Eo and E„ in Equations (114), it follows that the __ #11 - nix Positions of the
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