. The electron microscope, its development, present performance and future possibilities . b. Fig. 38 As we always reduce errors to the object plane, we can conveniently imagine the lens replaced by a mirror, at a distance f from the object, as shown in figure 38b. The photographic * Cf. also the very simple proof of the Abbe limit by Henriot, quoted by Marton, et al.^T' ^9

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