Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 102
il of incident rays. If this object is observed in air, tin-radiation from every point of the object is, in consequence of tin-diffraction effect, composed of an axial pencil S, fig. 66 (the directcontinuation of the incident rays), and a number of bent-off pencils,■Sj, S2, . . . surrounding S.1… … beam is reduced in the exact proportion of w, and the angle is re-duced also—that is, the whole fan of the diffracted rays is contractedin comparison with its extension in air. Fig. 67 will represent thecase of the same object in oil. If now any dry objective (with a given angular semi-aperture…
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