An introduction to projective geometry and its applications; an analytic and synthetic treatment (1905)
Emch, Arnold, b. 1871 · New York, J. Wiley & sons; London, Chapman & Hall, limited · leaf 180
initenumber of solutions. Make the constructions as indicated. THEORY -OF CONICS. 167 § 44. An Optical Problem. I. The following problem stated by Cremona in his Elementsof Projective Geometry, p. 199, is an application of Ex. 4 of theprevious section: A ray of light emanating jrom a given point A… … Designate in Fig. 74 the reflecting lines by a, b, c,. .., n.Through A draw any ray a^ striking a at A^. The reflected 168 PROJECTIVE GEOMETRY. ray h^ passes through the point B which is symmetrical to Awith respect to a. The ray h^ strikes h at -Sj, and its reflectedray c^ passes through C, which…
Geometry, Projective · Geometry, Analytic
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