Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 15
)rism the colors are still more widely separated and if the beamis allowed to fall on a white surface we obtain a long colored strip,red at one end and blue at the other. Such a colored .band istermed a spectrum. Tl:e breaking up of the original beam into its … Deviation of ray by a prism. 12 phenomena are propagated. separate colors is said to be due to the dispersion of the prism, whichis anotlier term for the variation of index with color. It has been shown that light is periodic in nature and is })ropagatedas waves in a manner analogous in some…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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