Alhacen on image formation and distortion in mirrors. A by Alhazen (lbn al-Haytham), 965-1039 ; A. Mark Smith (editor,

By Alhazen (lbn al-Haytham), 965-1039 ; A. Mark Smith (editor, translation, commentary)

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Additional resources for Alhacen on image formation and distortion in mirrors. A Critical Edition, with English Translation and Commentary, of Book 6 of Alhacen’s De aspectibus. Volume One - Introduction and Latin Text, Volume Two - English Translation

Sample text

E)/minutie: minute ER 80 confunduntur corr. ex confundantur P1/possent: posset S 82 debilitationem: debilitatem R 83 qui om. FP1; inter. L3; que O/directe om. P1 84 manifeste corr. ex manifefeste F/post manifeste scr. et del. quod L3/sola reflexione transp. R 85 si om. S/post si scr. et del. o P1 86 aliquid: quid E 87 contrarius: concursus S/est eis transp. E/est . . situs: eis situs est adinvicem R/adinvicem corr. ex advicem a. m. C1/alii . . dextrum (88) inter. E 88 post est add. erit P1/ymagini .

The amount and type of curvature can vary, however, if point C is moved to and fro along line of reflection EB. Accordingly, the image of C can appear beyond point Q, leaving the whole image TQH concave with respect to the center of sight at O. Or it can appear between points Q and B, leaving the whole image TQH convex with respect to O. Furthermore, depending on its location with respect to center of sight O and the axis of the cylinder, C can have as many as four images, so there can be as many as four images of line ICS with endpoints I and S fixed in the position illustrated in the figure.

Locus ymaginis A sit punctus D, locus ymaginis B sit E, et ducatur linea ED, que quidem est ymago linee AB. Dico quoniam AB maior est ED, quoniam ED aut est equidistans AB aut non. 8] Si fuerit equidistans, planum quoniam est minor. Si non fuerit equidistans, producatur usquoque concurrat cum ea. Sit concursus Z, et a puncto E ducatur equidistans AB, que sit EH. Angulus EDH aut est acutus, aut rectus, vel maior. 125 post N add. ducatur P1/linea om. L3ER/aut1 inter. a. m. E 127 N om. O/ante linea add.

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