Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 25
ed. The measuringwedge in a range finder (fig. 14) is a prism of this sort. If the inci-dent ray is normal to the first surface, there is no deviation until the rf^ -y r i / ~ ^^~~ [f:^A^ U.^Measuring wodgo of range finder. 21 second surface is reached. If a is the rofracliu*, auj>;le of tlie… … .Vchromalicpris and the angle of deviation d is given by the equation: d = na-a={n- \)a (12) The-total angle through which the rays are bent by the measuringwedge of a range finder is only a few minutes and the separation ofthe different colors is so slight thatit is not taken into account in…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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