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# Title: Leibniz-Handschriften zur Optik und Dioptrik LH 37, 2
# Folio 115r, page id 00068531:0229
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Cartesii explicatio Refractionis
censiore
Radius AB veniens ex medio denso ruminu
CDBF superficiem  mediga rarieris
ADB atque incidens in idensius CBDEC refringitur
adperpendicular seu radius refractus BC
angulum facit EBC majorem quam erat
angulus  incidentiae
AB
Hujus rationem Cartesius ita reddita supponit
et recte quidem motum AB  motum
vel impulsum aut conatum secundum directionem
AB. intelligi posse componi ex dti  conatibus
secundum directiones AD. DB.
B in
conatui autem
actare non obstatu superficiem resinem
 repringens, sed tantum motui conatui
D. itaque conatus AD tantum iuminuitur u
st posita EC aequali DB, erit BE mino
quam AD.
Supponit itaque Cartesius medium rarius ut aerem
magis obstareradio quam densius
ut lumen, idque conatur explicare comparatione
duarum tabularum mmore dun quarum una superficiem habet
duram et politam, altera tapete instratam. Quemadmodum enim
mollities tapetis. magis globuli in eo decurrentis celeritatem minuit
ita raritas quoque medii lucis vim debilitat
Mitto jam comparationem hanc minime ad rem quadrare
tantum ostendam, etiamsi omnia concedantur quae postulat sartesius
minime rem succedere. Quod ita breviter ostendo. Experimento constat
Tadium BC medio raro rursus egredientem in medum CGH aeque
densum ac erat primum ABd resumere prissam inclinationem, ac
radrum secundo refractum CG esse primo ante refractionem AB
parallelum. Hoc vero ostendam ex ratiocina hypothesi Cartesii
evenire non posse. Nam ladix qui resistentia sive