By A. Mark Smith
Someday among 1028 and 1038, Ibn al-Haytham accomplished his huge optical synthesis, Kitab al-Manazir ("Book of Optics"). by way of no later than 1200, and maybe a little bit previous, this treatise seemed in Latin below the name De aspectibus. In that shape it was once attributed to a undeniable "Alhacen." those modifications in name and authorial designation are indicative of the profound transformations among the 2 models, Arabic and Latin, of the treatise. in lots of methods, actually, they are often seemed now not easily as assorted types of an identical paintings, yet as diverse works of their personal correct. therefore, the Arab writer, Ibn al-Haytham, and his Latin incarnation, Alhacen, symbolize designated, occasionally even conflicting, interpretive voices. And a similar holds for his or her respective texts. To complicate issues, "Alhacen" doesn't symbolize a unmarried interpretive voice. there have been not less than translators at paintings at the Latin textual content, considered one of 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. presented 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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Additional 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)
Thus, each of the forms extending from differentbodies through the same air extends along its own line and passes through to facing forms. 85]Moreover,evidence thatlight and colors do not mingle in air or in [other]transparentbodies is [found in] the fact that, when several candles are at various distinct locations in the same area,and when they all face a window that opens into a dark recess, and when there is a white wall or [otherwhite] opaque body in the darkrecessfacing thatwindow, the [individual] lights of those candles appear individually upon that body or wall accordingto the number of those candles;and each of those [spots of light] appearsdirectlyopposite one [particular]candle along a straightline passing throughthe window.
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.
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. And the form that is refractedin this way at the ex- 366 ALHACEN'SDE ASPECTIBUS tremityof the normal [at the point of refraction]reachesa point to the left of the point on the surfaceof the glacialiswhere that perpendicularintersects it.
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