Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 23
irst mirror is viewed inthe second, the characters are reverted twice and are again normal.In general, any evennumber of reflec-tions leaves the im-age in the normal,any odd number ina reverted aspect. In-figure 12, themethod of locatingan image formedby two successivereflections at twomirrors is… … -B ima<re of O V -Images formed by formcd by
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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