Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 77
rent emission in different directions, the quan-tities of light emitted by an element in the same medium in conesof different angle such as w and w, fig. 35, are not in the ratioof the solid cones, as would be the case with equal emission,but in the ratio of the squares of the sines of the… … Fig. 35.—The unequal emission of rays. is no contradiction between the measure of the aperture of an ob-jective (n sin u) and that of the quantity of light admitted by it,the latter being (n sin u)2. The simplest experimental proof of the unequal emission indifferent directions will be found in the…
Microscopy
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