Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 14
erefracted ray travels along NB. In figure 4 we have total internalreflection and there is no refracted ray. All the light is reflected atAB and travels in the direction ND. For a surface separating glass and air, if the index of refractionis 1.5, the critical angle is 42°, since If, therefore, a…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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