Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 13
ight. If we have a polished transparent surface, the amount of reflectedlight varies with the index of refraction of the material and the angleof incidence. For a surface sep-arating glass and air from 4 to 6 percent is reflected when the angle ofincidence is small, that is, whenthe light falls… … ■Angle of incidence lessangle If the ray is traveling within a idense medium and falls upon asurface bounding a less dense medium, the quotient /„, is greaterthan 1. It is seen that under such circumstances there may be values ofsin i, for which equation (4) indicates a value of sin / greater…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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