By A. Mark Smith
Someday among 1028 and 1038, Ibn al-Haytham accomplished his huge optical synthesis, Kitab al-Manazir ("Book of Optics"). by means of no later than 1200, and maybe a little bit past, this treatise seemed in Latin below the identify De aspectibus. In that shape it used to be attributed to a definite "Alhacen." those adjustments in identify and authorial designation are indicative of the profound variations among the 2 models, Arabic and Latin, of the treatise. in lots of methods, in truth, they are often looked no longer easily as diversified models of an identical paintings, yet as assorted works of their personal correct. consequently, the Arab writer, Ibn al-Haytham, and his Latin incarnation, Alhacen, characterize exact, occasionally even conflicting, interpretive voices. And an analogous holds for his or her respective texts. To complicate issues, "Alhacen" doesn't signify a unmarried interpretive voice. there have been not less than translators at paintings at the Latin textual content, one in all them adhering faithfully to the Arabic unique, the opposite content material with distilling, even paraphrasing, the Arabic unique. hence, the Latin textual content provides now not one, yet at the very least faces to the reader. quantity This two-volume serious variation represents fourteen years of labor on Dr. Smith's half. provided the 2001 J. F. Lewis Award. quantity Two--English Translation
Read Online or Download Alhacen's Theory of Visual Perception (First Three Books of Alhacen's De Aspectibus), Volume Two - English Translation (Transactions of the American Philosophical Society) PDF
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Someday among 1028 and 1038, Ibn al-Haytham accomplished his huge optical synthesis, Kitab al-Manazir ("Book of Optics"). via no later than 1200, and maybe a bit prior, this treatise seemed in Latin below the identify De aspectibus. In that shape it was once attributed to a definite "Alhacen. " those adjustments in identify and authorial designation are indicative of the profound ameliorations among the 2 models, Arabic and Latin, of the treatise.
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Extra resources for Alhacen's Theory of Visual Perception (First Three Books of Alhacen's De Aspectibus), Volume Two - English Translation (Transactions of the American Philosophical Society)
And since vision is due to forms reaching the eye from visible objects, the glacialis will sense none of the forms of visible objectsthat reachit along refractedlines. 33]Furthermore,none of the formsreachingthe surfaceof the glacialis from visible objectswill be arrangedon the surfaceof the glacialis according to reality,and none of the forms reaching the surface of the glacialis from the partsof the individual objectwill be arrangedon the surfaceof the glacialis accordingto realityexcept for the forms reachingit directlyalong the perpendicularsdropped to the surfaceof the eye.
Hence, the effect that the visible objectcreates in sight when it faces what arousessensation in it is realizedonly throughthe transparencyof the medium between the eye and the visible object. The TRANSLATION:BOOKONE 371 light and color of a visible object are thereforeperceived by sight only by means of the effect of that light and color in the eye, and this effect is not created in the eye by color and light unless the medium between the eye and the visible objectis transparent. 50]In terms of its essential relationshipto light and color, transparency differs from opacity only insofar as the form of light and color passes through a transparentobject,whereas it does not pass through one that is not transparent,and insofaras a transparentbody receivesthe form of light and color and transmits it in [all] directions facing the light and color; a body that is not transparent,on the other hand, does not possess this quality.
96]It has also been shown by induction that,when intense colors are situated in dark places and the light that shines upon them is very weak, those colors will appeardarkand will not be [properly]discernedby sight. 114Therefore,when a viewer looks at an opaque objectupon which the form of the color has shone, he will perceive that form by means only of a secondary form reaching him from that form [shining on the object]. Now sight does not perceive the opaque body upon which the form appearsunless some light appears in it, whether it be the light that accompanies the form of the color shining on it or that light along with some other light.
Alhacen's Theory of Visual Perception (First Three Books of Alhacen's De Aspectibus), Volume Two - English Translation (Transactions of the American Philosophical Society) by A. Mark Smith