By A. Mark Smith
Someday among 1028 and 1038, Ibn al-Haytham accomplished his enormous optical synthesis, Kitab al-Manazir ("Book of Optics"). through no later than 1200, and maybe a bit past, this treatise seemed in Latin lower than the name De aspectibus. In that shape it used to be attributed to a undeniable "Alhacen." those transformations in name and authorial designation are indicative of the profound transformations among the 2 types, Arabic and Latin, of the treatise. in lots of methods, actually, they are often seemed now not easily as diverse models of an analogous paintings, yet as diversified works of their personal correct. consequently, the Arab writer, Ibn al-Haytham, and his Latin incarnation, Alhacen, symbolize particular, 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 at the very least translators at paintings at the Latin textual content, one among 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 at the least faces to the reader. quantity This two-volume serious version represents fourteen years of labor on Dr. Smith's half. offered the 2001 J. F. Lewis Award. quantity Two--English Translation
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)
And we find that when the eye faces a visible object,it will sense it; but when it is removedfromthatfacingposition, it will not sense it, whereas when it is broughtback to the facing position, the sensation returns. Likewise, we find thatwhen the eye senses a visible objectand then [the viewer] closes his eyelids, the sensationceases;but when he opens his eyelids while the visible objectfaceshim, the sensationreturns. Now a cause is such that, when it ceases to operate, what it causes ceases to exist; and when it is brought back to bear,what it causes comes back into existence.
The forms,moreover, that arerefractedat the surfaceof the eye reachthe surfaceof the glacialisin reverse order. And in addition to that, the form of one point is spread out upon an area of the surface of the glacialis ratherthan arrivingat a point, and this follows from the fact thatwhen the form of a right-handpoint with respect to the eye reaches a point on the surface of the eye, assuming that the line along which that form extends is oblique to the eye's surface,it will refractto the left of the normal dropped from the center of the eye to that point on its surface.
35]The same will hold for the [relative]position of the two lines along which the two forms are refractedat one point on the surfaceof the eye, for the two forms that are refractedat one point both approach the normal, and, after intersecting [the normal], the form that arrived along the line fartherfrom the normal continues along a line that is also fartherfrom the normal,but less so than before. 36]And if this phenomenon is experimentallyscrutinizedwith great care,the result will be found to agree with what we have claimed.