Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 55
ussing is performed by varying the curvature of thecrystalline lens. Muscles attached to the periphery pull upon thelens until it becomes flatter or relax and permit it to become morecurved. This process of focusing is termed the accommodation ofthe eye. The limits of accommodation are the two… … Fig. 50.—Section of eye. ire transmitted to the brain bv the 52 • infinity and a point about 12 inclies in front of the eye. Actually,the limits are greater than this. Most eyes can accommodate for anobject beyond infinity, i. e., for a convergent pencil of light or for anobiect 4 or 5 inches in…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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