itatiscentrum G verfatiir intra radium FC cori-vexitatis ACB &: cjus resquidiametruiiiC Hjfive intra F & H. Dico ita dTc F G differen-tiam radiorum ad F C radium convexitatis, iicutdupla G L five diameter concavitatis ad C K di^ftantiamfoci,. Certum enim eft^quodviprim^refradionisradius DE… … :T ■ic? H emon- \K angulus H O G ad angulum O H G ficut H G ad ^^°-G O /eu G L : &ita eft dimidius G O H ad angu-lum O H G licut dimidia G H ad G F j veliicuctota G H ad duplam G L : ut autem femiilis an-guliGOHfeu angulus HOK refradionis adangulum OHG , ita HK ad O K feu LK pertrigonometriam…
Optics, Geometrical · Optical instruments
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