Abstract
Having recently had to photograph some small solids on an enlarged scale, I was led to enquire into the conditions as to the angular aperture and focal length of the lens which would give the best definition in the picture obtained. If the actual distance apart of the closest points in the object which must be separated in the picture is greater than several wave-lengths of the light employed, the problem may be solved by geometrical optics.
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Schedule a callMore From: Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character
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