Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 21
ed virtual because therays do not actuallypass through O butonly appear to do so.With curved mirrorsor lenses we shall haveexamples of imagestermed real inwhich the rays actu-ally pass through thepoint where the im-age is located. If the object beforethe mirror is an ex-tended one, insteadof a… … Fir,. 10.—Reversion by a plane mirror. 18 version. If we imagine the drawing, figure 10, to represent aplan view, the arrow viewed from a point P, (with the mirror re-moved) will be seen with the point to the right of the observer. If ABCDEFGHI J
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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