" An experiment having a h2o-stuffed glass sphere was carried out and al-Farisi showed the extra refractions due to glass may very well be disregarded in his design.[74][c] As he noted in his Kitab Tanqih al-Manazir (The Revision with the Optics), al-Farisi made use of a large very clear vessel of glass in the shape of the sphere, which was full of… Read More