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" An experiment with a h2o-crammed glass sphere was performed and al-Farisi showed the extra refractions a result of the glass may be dismissed in his product.[74][c] As he mentioned in his Kitab Tanqih al-Manazir (The Revision of the Optics), al-Farisi applied a big distinct vessel of glass in The form of a sphere, which was crammed with water, so