Two-point resolution for ordinary microscopy was studied in a bright background under partially coherent light. The basic equation was derived from the unified theory of image intensity for two point-like objects for bright and dark backgrounds. For an extended Rayleigh’s criterion, it is shown that the two-point resolution in a bright background is noticeably different from that in a dark background. The resolution for annular illumination is also dealt with, and its characteristics are elucidated.

中文翻译：

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部分相干光下明亮背景中的两点分辨率

在部分相干光的明亮背景下研究了普通显微镜的两点分辨率。基本方程式是根据明亮和黑暗背景下两个点状对象的图像强度统一理论得出的。对于扩展的瑞利准则，表明在明亮的背景下，两点分辨率与黑暗的背景下明显不同。还讨论了环形照明的分辨率，并阐明了其特性。