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Download Alhacen's Theory of Visual Perception (First Three Books of by A. Mark Smith PDF

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By A. Mark Smith

Someday among 1028 and 1038, Ibn al-Haytham accomplished his enormous optical synthesis, Kitab al-Manazir ("Book of Optics"). by way of no later than 1200, and maybe a little prior, this treatise seemed in Latin less than the identify De aspectibus. In that shape it used to be attributed to a undeniable "Alhacen." those changes in name and authorial designation are indicative of the profound adjustments among the 2 types, Arabic and Latin, of the treatise. in lots of methods, in truth, they are often seemed now not easily as assorted types of a similar paintings, yet as assorted works of their personal correct. hence, the Arab writer, Ibn al-Haytham, and his Latin incarnation, Alhacen, signify specific, occasionally even conflicting, interpretive voices. And a similar holds for his or her respective texts. To complicate concerns, "Alhacen" doesn't symbolize a unmarried interpretive voice. there have been at the least 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. accordingly, the Latin textual content offers no longer one, yet no less than 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

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Read 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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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)

Sample text

102]All of this will obtainwhen the light that illuminatesthe colored body is intense and the whiteness of the form that shines from it upon the facing body is dull. If, however, the light in the coloredbody is weak, then the form that shines from it upon the facing body will be dark, and it will appearto the eye just like the colors it perceivesin dark,poorly lit locations or the colors of transparentbodies upon which weak light shines. Hence, when the light thatshines upon coloredbodies is feeble and when the forms of their colors shine on facing bodies, they will only appear as shadows as far as visual sensationis concerned.

The surfaceof the glacialis and the surface of the eye-then it is also not impossible for the visual perceptionof visible objectsto be due to the forms of light and color coming to it from the surfaces of [those] visible objects,if the perception of those forms takes place along perpendicularlines alone. And this is so because it is in the natureof sight to receive forms that reachit from visible objects,and also because, in addition to this qualification,it is in the natureof sight only to acceptthose forms that reachit along specific lines, not along all lines;and these specific lines are the straightlines alone whose endpoints meet at the center of the eye, and these lines converge at the center because they are diameters (of the eye, that is) and are perpendicularto the surface of the sensing organ.

100]And since this is so, they are perceived mingled together,and the secondary forms that reach the eye from the form of color that shines upon the body facing it will always be perceived by the eye mingled with the form of the color of that body, as well as with the form of its light. The eye thus perceives a form derived from the two colors [and] that [form]is differentfrom the form of either of them. If, then, the opaque body upon which the form [shines] is of a bright color, the form it conveys to the eye will be bright, and it is a primaryform, and it is mingled with the secondary form that reachesthe eye from the form of the color shining upon that TRANSLATION:BOOKONE 383 body.

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