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Figures for Introduction and Latin Text
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Accordingly acute Alhacen appear axis bisects cathetus center of curvature center of sight common section concave cylindrical mirrors concave spherical mirrors cone conic section conical mirrors construction convex cylindrical mirrors curved cylinder's direct vision draw line elliptical endpoint of tangency equal to angle ergo Euclid extend line form of point Hence image-location intersect line let it intersect let us connect let us extend Likewise line DG line HT line of longitude line of reflection line TH linea longitude mirror's surface misperceptions Moreover normal object-line object-point parallel to line perceived perpendicular plane containing plane of triangle plane passing plane tangent point of reflection point on line point Q previous conclusions proposition proposition 22 punctus rectangle reflected to point reflected vision respect right angle side sight lies slanted straight line subtended visible line visible object