Alhacen on image-formation and distortion in mirrors: a critical edition, with English translation and commentary, of book 6 of Alhacen's De Aspectibus, the medieval Latin version of Ibn al-Haytham's Kitāb al-Manāzir
Smith (history, U. of Missouri) is working his way through Alhacen's (965-1039) study of reflection, which is a Medieval Latin version of ibn al-Haytham's Kitab al-Manazir. Book Six concludes the work by focusing on image distortion, applying the cathetus rule to an analysis of the various misperceptions that arise in the seven types of mirrors he studies in the two previous books. The first volume contains the introduction and Latin text; the second contains the English translation, a Latin-English and glossary, and the bibliography and general index. The volumes are numbered consecutively; the figures appear in both.
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according acutus Alhacen Alhacen's analysis angulus appear arabico arcu axem axis book cathetus center of sight centro centrum chapter circle circuli circulum columpnaribus columpne comprehenditur concave spherical mirrors concavis concurret contingens contingentem continuemus convertitur convex corr curved ducatur linea due linee duo anguli duo puncta dyameter eius ellipse equalis angulo equalis arcui equidistans erit ymago erunt extrahamus finis contingentie form FP1O hiis speculis Igitur image intersect L3/post L3ER line of reflection linea recta lines locus ymaginis longitudinis maior minor mirror's surface multiplicatio object object-line object-point perpendicularis super superficiem piramidis producatur proportio proposition puncto punctum quadrato quadratum quoniam R/et R/post refertur reflect reflecting surface reflectitur reflexionis rei vise respect same secabit secat secet sectionis sectoris sicut similiter Smith spericis super lineam superficie transp trianguli triangulus tunc version visus fuerit