Abstract
THE questions proposed cannot be answered quite so definitely as Mr. Scholes would appear to think. To begin, we must have a clear idea of what is meant by the separating power of a telescope. Put in a theoretical form, it means: Given two points of light (stars) a certain angular distance apart, what is the size objective which will just give two distinct images in the focus? For practical purposes, this is answered by the formula
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LEWIS, T. Separating Power of a Telescope. Nature 84, 266–267 (1910). https://doi.org/10.1038/084266e0
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DOI: https://doi.org/10.1038/084266e0
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