Two-point Resolution in Partially Coherent Light

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Abstract
This paper is an extension of an earlier paper to cover the study of the effects of the annular source of illumination in ordinary microscopy on the resolution of general two-point targets. The limit of resolvable separation has been obtained, = (K s + j)u/sin f, where K s + 0·446 + 0·32 o gives the Sparrow limit when the illumination is such as to yield a degree of coherence, o, between the two particles at the limit of resolution. It is also seen that this resolution does not change significantly with the width of the annular source having a fixed mean radius.

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