Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 50
nly by enlarging thesize of the lens. When two near points viewed through a lens areso close together that they can not be distingushed as two d tpoints, it is said that they are not resolved or that they are so closetogether as to make separation impossible without the use of a lensof greater… … If the aberrations arc reduced to such an extent that they do notaffect the resolving power and if the rays are parallel and incidentupon a lens of diameter d (measured in inches), then the limitingangle of resolution in seconds denoted by r will be given by theequation: -^ » . If the aberrations…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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