The Influence of the Condenser on Microscopic Resolution

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, , Citation H H Hopkins and P M Barham 1950 Proc. Phys. Soc. B 63 737 DOI 10.1088/0370-1301/63/10/301

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1 Imperial College, London

Dates

  1. Received 13 April 1950

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0370-1301/63/10/737

Abstract

An expression is found for the distribution of light in the image of two small apertures which are illuminated by a condenser of numerical aperture equal to s times that of the imaging objective. The resolving power of the system is written ρ=Kλ/(N.A.), and K is found as a function of s. It is shown that precisely the same result obtains for both critical and Kohler illumination.

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