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a_.m Alhazen's De aspectibus alter angle of incidence angle of reflection Anthemius of Tralles appear Avicenna cathetus of incidence Catoptrics center of sight circle ABC common section concave mirrors cone convex mirror demonstrated digits draw line end-points equal to angle equal to line Euclid XI Euclid's Elements figure form of point greater than angle Hence hole incidence and reflection let line line AC line BG line CF line DB line drawn line of incidence line of reflection linea locus midpoint mirror's surface object of sight obliquely Optics parallel to line Pecham perpendicular to line plane mirror point G point of reflection polished body puncti Q.E.D. Proposition reflected back reflexionis right angle Roger Bacon speculi straight line super/supra surface of mirror surface of reflection surface tangent tablet theorem triangle viewer vision Witelo