Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 238
are completed and equallyluminous throughout. When the crystals have the propertyof double refraction, and when their axis is perpendicular tothe plates, more beautiful combinations will be produced. (164.) Among the luminous phenomena of the atmosphere,we may here notice that of converging and… … rays passing through openings in the clouds, while the adjacent portions are obstructed by the clouds. The phenomenon of converging beams, which is of much rarer occurrence, is U2 ggm* 234 A TREATISE ON OPTICS. PART III. shown in fig. 139., where the rays converge to a point. A, asfar below the…
Optics
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