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不相干情形反应函数在评价光学成象质量方面所起的作用,已经有过许多研究。本文研究在一般情况下(包括相干不相干和部分相干)反应函数的表示式和它的物理意义,显示出它起着选择传送光学信息的作用。据此证明具有纯位相差的物体可以通过离焦(Defocusing)的方法观察出来,双星的角距也可以用离焦的方法来测量。This paper gives an expression of the optical frequency response function suitable for both the incoherent and the coherent optical system. Its physical aspect reveals that the frequency response function plays the role of an information selector.The Becke phenomenon for detesting small refractive index difference between object and its surrounding medium by observing the apparent movement of the diffractional border line (Becke line) on defocusing the optical system has been explained.
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