um radii fiant divergentes. Ergo fpecillum cavum 6cc. quod eratdemonflrandum. j Propofitio IX. Theorema. ^Tfl Specillum concauum, cujus concavitas ad eandemfph&ram mrtirjet^adqmrncon^exttaiLentis aherimcon^exae , Jiaf^ eadem Lentt convexa itaremoveatur^utejm… … I
Optics, Geometrical · Optical instruments
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