Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 132
CHAP. XVII. DOUBLE REFRACTION. 127 a whole revolution of the crystal; and at two other oppositepoints, nearly at right angles to the former, the lines will beat their greatest distance. If we place a black spot at O, ora luminous aperture, such as a pin-hole in a wafer, with lightpassing through… … double, as at O and E; and by turning the crystal round asbefore, the two images will be seen separate in all positions;the one, E, revolving, as it were, round the other, O. Let a ray or pencil of light, R r, fall upon the surface ofthe rhomb at r, it will be refracted by the action of the…
Optics
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