Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 35
y r, is positive. In the triangle OIC OC —u + r sin i IC r sin I Similarly in triangle OlC, (21) CO -r+ri^_^su^^ ^^2) IC r ~ ^sin I Combining these two equations -u+r ^sini^ (23) — r+u sin i sin I 31 Since, in accordance witli tlio law of refraction • ^, = - this may be sin in, -^ written ■ li + /•… … Fig. 32.—Refraction at a spherical surface. and this may be A\Titten: 77, na^ri;-u u r (26) As in the case of the curved mirror, the image at O is ap{)roximateand the approximation improves as IV is made smaller. It will be noted that if n, = 1, 713= — 1, equations 26 and 18 becomeidentical. In…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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