Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 82
e object at nearly 41° will always emerge in air at anangle of nearly 90° (a), and in oil at nearly 41° (a), so that thesame rays which in air are expanded over the whole hemisphere arecompressed into 82° in oil, and, therefore, rays beyond 82° in oilmust represent surplus rays in excess of those… … Fig. 80.—Comparative compression of.light rays in two different media. 58 VISION WITH THE COMPOUND MICEOSCOPE occupy the whole hemisphere (fig. 40) are in oil compressed withinan angle of 82° round the direct beam (fig. 41), so that there is roomfor additional beams. The unequal equivalent of equal…
Microscopy
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