Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 80
sed, the mistake of thepreceding view is appreciated. The 170° in air of fig. 37 is notequal to, but much less than, the 170° in balsam of fig. 38, and not-withstanding that a great part of the latter does not reach the proportion of the squares of their radii, it follows that if we designate the… … Fig. A 2.—The hacks of two ohjectives of the same power but different apertures. The student will observe that the radius of Bis twice that of the radius of A Jconsequently the area of B will be four times as great as that of A; which meansthat, since the numerical aperture of the objective B is…
Microscopy
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