in which (n1 — n0) is the dispersion and va the Abbe number for the glass (see § below), assuming A0 and A1 are chosen for the standard definition of va. If A1 > A0 (i.e. A1 more into the red), there will be undercorrection of the mirror aberration, overcorrection into the blue. The transverse aberration generated by this spherochromatism is determined by the slope of the wavefront of (3.243):

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