Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 50
the ordinary action of the Microscope ; but the instru-ment is subject to certain optical imperfections, the mode ofremedying which cannot be comprehended without an acquaintancewith their nature. One of these imperfections results from theunequal refraction of the rays which pass through lenses… … Diagram, illustrating Spherical Aberration. exactly in the foci already stated; but that the focus f of the raysab, ab, which have passed through the marginal portion of thelens, is much closer to it than that of the rays a b, a b, which arenearer the line of its axis. This may be shown…
Microscopy · Biology
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