DETAILS, FICTION AND HWGACOR

" An experiment by using a water-loaded glass sphere was executed and al-Farisi showed the extra refractions a result of the glass could possibly be ignored in his design.[74][c] As he observed in his Kitab Tanqih al-Manazir (The Revision from the Optics), al-Farisi made use of a substantial clear vessel of glass in The form of a sphere, which was