hibeatur in diftantia fui foci a priori toco; cumradii ita poft ipfamprogreffijri fint parallcli, uc fu- pra demonftratum; idco in modum virgse focus iftc continuari potcric, adeoquc quovis loco comburerc. Sic fi Lentis convex^ A B focus cirec in C, quia Solis F H radii ob nimiam clongacioncm in… … fcd Syntagma. 17/, Cafut XiV^ 257 fcdphyficumcumaliqua latitudinc, itautpaululumclongatumtam ante quampoftC ratisadhucintenficolorisrcmancat,quopoflitcomburere. Si itaque lo-coD E comburercpo{fit,appliceturibiLenticula minimajfphasrulaB, fic utejusfocus quoquefit in foco C priorisLentis AB;…
Optics, Geometrical · Optical instruments
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