Abstract
The classical theory of the focusing of light predicts that light energy is highly concentrated in the geometrical focal plane; in other words, the geometrical focal plane contains more energy per unit area than any other plane parallel to it. However, it has recently been shown that the classical theory is valid only for focusing systems of large Fresnel number. This paper examines how the maximum encircled energy is accumulated in the geometrical focal plane as the Fresnel number of the diffracting aperture increases.
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