Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 16
ously from one end of the spectrum tothe other. The spectrum of the sun contains numerous dark lines superposedon the continuous background. These dark lines correspond to fre-quencies which are absorbed by the atmospheres of the sun and earthand do not reach the observer. As the relationship… … G ^H Fig. 6.—Path of minimum deviation through a prism. 13 C, D, F, and G linos are the ones commonly referred to in opticalcomputations. The D line lies in the yellow portion of the spectrumand is near the region of greatest luminosity, i.e., for light of approxi-mately this color the greatest…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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