Abstract
WITHOUT entering into a discussion of the correct interpretation of high power microscopic images, which is a very recondite subject, I should like to point out that Mr. Mallock's statement in NATURE of Oct. 13 that an object of alternate opaque and transparent lines cannot be separated by any method if their spacing is much less than a wave-length, is not confirmed by experience. Lines of this nature on the surface of etched steel have been photographed by visual light, which are not more than 1140,000; of an inch in their spacing, and can also be seen when approximately of this size. There is some evidence to show that lines nearly twice as fine can be photographed by ultra-violet light of wave-length 1850.
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BECK, C. The Depth of Field and Resolving Power of Optical Instruments. Nature 122, 650 (1928). https://doi.org/10.1038/122650a0
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DOI: https://doi.org/10.1038/122650a0
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