Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 31
d as made up of two right angle reflecting prisms built in onepiece. It does not invert or revert the image nor change the direc-tion of the beam of light but displaces it parallel to itself. Thisprism forms one of the components of the ocular prism of the rangefinder and is also used in one of the… … . Fig. 29.—Reflection at a spherical surface. termed the axis of the mirror and the point V, the vertex. Thelocation of the image of the point O is to be determined. A ray fromO incident upon the mirror at I is reflected in the direction 10,where 10 is so drawn that angle OIC equals angle OIC. The…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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