Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 11
e divided bythe sine of the angle of refractionis equal to a constant n characteristic of the two media and termedthe index of refraction of the second medium with respect to thefirst. These two laws are sufTicient to determine the path of a raywhen the initial path and boundary and indic(>s of… … the angle of reflection. (7) «% ^ 8 The refraction and reflection of a ray of light is ilkistrated in figure1. AB is the trace of the refracting surface which separates the firstand second medium. CN is the incident ray incident upon the re-fracting surface at N. It is there divided into two…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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