🔬 Discovery

Al-Kindi's De aspectibus: Arabic geometrical optics

De aspectibus de al-Kindi: óptica geométrica árabe

Date
c. 850 · confidence medium
Place
Baghdad, Iraq
Credited to
Yaqub ibn Ishaq al-Kindi
Field
Communication

What was discovered

Al-Kindi develops Euclid's geometrical optics in a treatise on the rectilinear propagation of light, perspective and mirrors, and criticises pure emission theories of vision. It is the first major optics of the Islamic world, preceding Alhazen.

The Arabic original is lost; it is known from Gerard of Cremona's 12th-century Latin version.

What it led to

  • the optics of Ibn Sahl and Alhazen
  • medieval Latin diffusion (Gerard of Cremona, Roger Bacon)
  • mathematical study of vision and burning mirrors
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Sources✓ verified 2026-11-06