Al-Farisi, Kamal al-Din Hasan ibn Ali ibn Hasan, Fig. 1From: Al-Farisi, Kamal al-Din Hasan ibn Ali ibn HasanDouble refraction and single reflection in a raindrop. Simultaneously with Theodoric of Freiberg, al-Farisi was the first to give the correct explanation of the rainbow in his Tanqih al-Manazir (©Library of the Masjid Sepahsalar, Tehran)Back to chapter page