Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 26
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 … Fig. 17.—Right angle reflecting prism Porro prism. refracted at L on emergence and the two refractions are such thatthe one neutralizes the other and all the parts of the beam, regardlessof color, are bent through the same angle and proceed in a commondirection after traversing the prism. The prism…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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