Plane and solid analytic geometry; an elementary textbook (1905)
Ashton, Charles H. (Charles Hamilton), 1866- · New York, C. Scribner's Sons · leaf 154
e also equal in the figure ? Note. — Parabolic reflectors depend on this principle. If a surface isformed by revolving a parabola about its axis, all waves of light, etc.,which start from the focus will be reflected in lines parallel to the axis ofthe parabola. 5. Two j?ar«6o?c?s ivhicli have the… … Tig. 74. The coordinates of any point L on the directrix maybe represented by ( — ^, ^i). The equation of P1P3, thechord of contact of tangents from this point, is I y^y = mx 138 ANALYTIC GEOMETRY [Cii. X, § 78 Since the coordinates of the focus I —, 0 J satisfy this equation, the chord of contact…
Geometry, Analytic
Internet Archive · Boston Library Consortium · Public Domain Mark 1.0. Free to use for anything.
