Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 21
ct light is termed a planemirror. Looking into the mirror one sees objects which are actuallyin front of the mirror as though they were located back of the re-flecting surface. The course of the rays of light is showTi in figure 9.Suppose O is a point sending forth rays of light. The ray ON… … Fig. 9.—Image of a point ii> a plane mirror. drawn through N and the point O located on the normal to the mirror through O, and as far back of the mirror as O is in front of the mirror. Similarly, the ray OM is reflected along the line ME, where ME produced also passes through O. In fact, all…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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