Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 68
dinary operation of the J\iicro-scope; but the instrument is subject to certain optical imper-fections, the mode of remedying which cannot be compre-hended without an acquaintance with their nature. One ofthese imperfections results from the unequal refraction of therays which have passed through-… … Diagram illustrating Spherical Aberration. exactly in the foci already stated, but that the focus f of therays ab, ab, which have passed through the peripheral portionof the lens, is much closer to it than that of the rays ab, ab,which are nearer the line of its axis ; so that, if a screen beheld…
Microscopy
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