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 slightly prior, this treatise seemed in Latin lower than the name De aspectibus. In that shape it was once attributed to a undeniable "Alhacen." those alterations 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 appeared now not easily as varied models of an analogous paintings, yet as diversified works of their personal correct. as a result, the Arab writer, Ibn al-Haytham, and his Latin incarnation, Alhacen, characterize targeted, occasionally even conflicting, interpretive voices. And an identical holds for his or her respective texts. To complicate concerns, "Alhacen" doesn't characterize a unmarried interpretive voice. there have been at the very least translators at paintings at the Latin textual content, one in every of them adhering faithfully to the Arabic unique, the opposite content material with distilling, even paraphrasing, the Arabic unique. therefore, the Latin textual content offers now not one, yet not less than faces to the reader. quantity This two-volume severe variation represents fourteen years of labor on Dr. Smith's half. provided 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 info 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)
Hence, the glacialis is alteredby light and colors only [at the time] it senses [them], but then the effect disappearsafterthey are removed. It is thereforerequisite that it be alteredby color and light, but not in a permanentway. 93]Moreover,the eye is constituted to suffer the effect of colors and light and to feel them, but the resulting alterationdoes not therebypersist in it. 94]It has thereforenow been shown that the eye is not tinted by colors and the forms of light in a permanentway. It has also been shown that the forms of light and color do not mingle in air or in [other]transparent bodies but that the eye perceives many of them at the same time through the [same] air; and each of the eyes perceives them accordingto the cone that is formed between the visible objectand the centerof the sight.
104]Thereforethe eye does not perceive the form of a color on a body facing that color except when the secondaryform reachingit from the form of its color is more intense and more overwhelming than the primaryform coming along with it from the light and color that are in the body upon which the form shines. But this situation is quite rare,and for that reason such a form is rarelyseen; moreover,among those [that are seen] only the form of intense, brilliant colors appears when the light that shines upon those colorsis intense, and when those forms shine upon facing,white bodies, and when the light shining upon those bodies is weak in relation to those forms.
66] And when the form reaches the surface of the glacialis, it will create an effect in it, and the glacialis will suffer that effect, because it is a property of light to affect the eye, and it is a property of the eye to be af- 376 ALHACEN'SDE ASPECTIBUS fectedby light. And thiseffectthatlight createsin the glacialispasses through the body of the glacialis along straight, radial lines exclusively, for the glacialis is constitutedto receive the forms of light along radial lines. And as the light passes throughthe body of the glacialis,color passes along with it, for color is mingled with light.