. Perspectiva commvnis : ideo sic dicta, quod contineat elementa tes optikes, omnibus philosophiæ studiosis necessaria : in hac enim doctrina inchoatæ disputatioes philosophoru, de natura, & proiectione radiorum unisus, luminum, colorum & formarum absoluuntur : in quibus & de speculis tractatur : summa cura & dilgentia emendata, & ab infinitis quibus scatebat mendis repurgata, necnon in quibus deficiebat demõstrationibus restituta . radus proportionalis primo in fitu,(fcilicet (TmiIisrefiftentia*).Sed tranfiais perpendicularis ingrediens uelegrediens fortiflimus eft: 6V radius non perpendicufa
. Perspectiva commvnis : ideo sic dicta, quod contineat elementa tes optikes, omnibus philosophiæ studiosis necessaria : in hac enim doctrina inchoatæ disputatioes philosophoru, de natura, & proiectione radiorum unisus, luminum, colorum & formarum absoluuntur : in quibus & de speculis tractatur : summa cura & dilgentia emendata, & ab infinitis quibus scatebat mendis repurgata, necnon in quibus deficiebat demõstrationibus restituta . radus proportionalis primo in fitu,(fcilicet (TmiIisrefiftentia*).Sed tranfiais perpendicularis ingrediens uelegrediens fortiflimus eft: 6V radius non perpendicufaris tantodebiIior,quato magis S perpendiculari remouetur,c\eo fortior,quopropinquior. Quandoigituroccurrit mediumdenfiuscVmag/srefiftensjneceflarius eft radio fortior fitus& direc1;ior,diredoe£ propinquior. Vnde ut tran*fituspermedium fecundum proportionetur tranfitui per primum,radius ad eam perpendicularemIiieamdeclinat,qua^ erigiturin punclo cafusfuliuper medium igitur quod perpendicularis Utas fortior dt9 non tamen per egrefFum & corpore Iuminofb,imd per cafum perpendi*cularem fuper medium* Nec intelligendum eft»radium ad fortiorem ficum declipare quafi per eleelioneirumd tranfitus per medium primum,ad n\sb( proportionalem in fccundojmpellitur^ficut pa, quod*cuncp medium perpendiculariter cadens,omninononrefrangitur,quia fua fbrtttudp nullius diapha, nitati$. Ll B ER n ■ ■ jnitatfs obie&u hebetatur. Apertius enim mouet omnis rad/usrecfte qu3m obliquecadens in obiedum, Verbigratia, £ corpo-rc luminofb per acrcm cadit perpendicularis a cqui uero fran-gitur cadit oblique a c, cV quafi procedcrct in b , fi euet mediumilmile, frangitu-r aut uerfus perpcndicular-em d c, dC cadit in e« Propofkfo XVI» Radius lucis uc! coforis£ perpendicukri diuerti*tur,cum rncdium fubtilius occurriu Harc (equitur ex prarmula, quomam enirn medium fecunddtninus reflftft, minor fortitudo congruit radqs in ipfumi den-frori cadentibus, u
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Keywords: ., bo, bookauthorpeckhamjohnd1292, bookdecade1540, booksubjectoptics
