Ibn-al-Haitam, al-Hasan Ibn-al-Hasan; Witelo; Risner, Friedrich, Opticae thesavrvs Alhazeni Arabis libri septem, nunc primùm editi. Eivsdem liber De Crepvscvlis & Nubium ascensionibus. Item Vitellonis Thuvringopoloni Libri X. Omnes instaurati, figuris illustrati & aucti, adiectis etiam in Alhazenum commentarijs, a Federico Risnero, 1572
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<head xml:id="echoid-head380" xml:space="preserve" style="it">77. Si à uiſu duæ rectæ lineæ tangant circulum (qui eſt communis ſectio ſuperficierum, refle
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xionis & ſpeculi ſphærici caui) tertia per centrũ ſecet: uiſibile cũ
<lb/>
uiſu à centro ſpeculi inæquabiliter diſtãs, poteſt reflecti à quolibet
pũcto peripheriæ inter tactus punct a ultra centrũ interiectæ: ex-
ceptis tactus punctis & ſecantis diametri termino. 31 p 8.</head>
<p>
<s xml:id="echoid-s11483" xml:space="preserve">COnſtat ex his:</s>
<s xml:id="echoid-s11484" xml:space="preserve"> quòd ſi ſumatur uiſus extra circulũ:</s>