riper EH, ac fire(5i:a veniret ex pundto K. Sit enim KL tertia pars hnex DK , viprima^ refradionis radius A E refringctur inE G , quafi procederet ex pun£to L. Duca-tur jam FEQ_&; radius parallekis MER ;producanturque radii AEinl, KE inH, &:LE in G ; cum fit ut A F ad diametrum feuduplam… … ■SiR V ,i S^vfdpi^ia l Caput IPi 3^ -fupplementi ejus Q^E A, ad iiniun anguli E A F ut autemrinus, ita 6c anguli,cum fmtvalde acuti. Ergo ica cil angulus inciinationis Q E AaxiangulumE AFyficut AF ad FE fcu F D, cfgo ut tertia pars anguli QEA ad angu-lum E A F; ita A F ad triplam F D feu…
Optics, Geometrical · Optical instruments
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