Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 409
nch grating. If, however, the objective be raised so that thegrating lies at P7 the diffraction elements of the second order only arebrought to the focal conjugate ; consequently by the hypothesis theimage will have 50,000 holes per linear inch, or double that of theoriginal. In other words,… … Fig. 320. Fig. 821. INTERPRETATION AND THE N.A. TABLE 377 Tlie effect of this is to give an impression that there i* a stronggrating with 25,000 holes per Linear inch ; and over it nnotJur grat-ing with 50,000 holes per linear inch. The raising the focus u to bring P to P necessarily gives the idea…
Microscopy
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