Fig. 4.11. Small section of corrector plate near edge, in cross section. Net ray deviation is
(n - 1)7.
increases as r^ and is a maximum at the edge; thus the marginal rays are deviated
by the largest amount.
If the corrector had a constant index of refraction it would affect rays of any
wavelength in the same way but, of course, this is not the case. Because n is not
constant the deviation is also a function of wavelength. Denoting the deviation by
6, a simple differentiation gives
dd/dX
—
ydn/dX.
(4.5.7)
Thus rays of different wavelength are directed in slightly different directions with
the effect larges ...
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