Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 38
fracted at the two coincidentsurfaces and will be a ^ ^ ^ undeviated. It maytherefore be ex-tended as a straightline. The ray OJ.,which is parallel tothe axis of the lens,will after refractionpass through F, the focus of the lens. Since the intersectionof any two rays serves to locate the image, 0/… … Fig. 37.—Image of an extended object by a thin leii 35 (33) If y aiul y are the length of ima<;e and object, respectively, y OiO, u This equation gives the magnification of the object. In the caserepresented in figure 37, / is negative and u positive. The quotientis negative and tliis is to be…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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