Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 335
orrected. Thus, let a, b, fig. 268, represent such an object-glass, and beroughly considered as a plano-convex lens, with a curve, a c b,running through it, at which the spherical and chromatic errorsare corrected which are generated at the two outer surfaces, andlet the glass be thus free from… … Fig. 268.— The twoaplanatic foci of anoptical combination. EFFECTS OF LISTERS DISCOVERY ON ACHROMATISM 305 surface, and i d to the plane one—under these circumstances tin-angle of (mergence, y e /1, much exceeds that of incidence, f I i,being probably almost three times as great. If the radiant is…
Microscopy
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