Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 25
efraction. There-fore, the prisms used in instruments in nearly all cases are of the type inwhich a reflecting surface is used to produce the deviation. Figure 16shows such a prism. The ray indicated by the full line falls upon thefirst face perpendicularly and proceeds as a single ray without… … M ling prism. 22 without being divided into its different colors. Tlie case is somewhatdifferent for a ray falling upon the first surface obliquely. The rayshown by the dotted line incident at J is refracted and we shouldexpect to find the final image colored. The ray, however, is again
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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