Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 46
aberrations are present the /f^ ^ ,—-1:=^^ ^^ 1 •/ s»———— ^-.E^^^^^ .--^^ Y if 1^ --^^^^^ b^ ^ h :i^ ^^^^ ^^..--^ ^^^ -■^ -^ \ ^ If-^^ - ^ v^ Fig. 44.—Astigmatism. course of the rays in the neighborhood of the image is as shown infigure 45. Cross sections of the pencil of light at several…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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