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# Title: Optica Promota, Seu Abdita radiorum reflexorum & refractorum Mysteria, Geometrice Enucleata (shelfmark Leibn. Marg. 94)
# Folio 22, page id 727094130:0034
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=727094130&page=34
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22. I21 )150
   nn  B
Radios parallelos in uno Diaphano, per aliud diversae donsitatis, aequi
3
distantes muttere.
Ic communis superres Clapatorum divertarum densicacum
plana, radicisicur patane, ih superticiem planam incidences.
aees lortiuntur aequaledencia angulos, ac proinde aequales
quoque renactiones, omne ergo eorum anguli retracti sunc equa-
les, qui cum tiane in superticiebus retractionum parallelis etticiune
quoque radios retractos parallelos, uE Patet Per convertum Prop. 10.
libri TI. Element. Quod erat oltendendum.
Scholium.
TlOc Frooenia Cclann n Feneralissime demonstretur, in le-
quencibus camen unum caneum illius casum uturpamus; Pempet
enim Ducimuscale planum per punctum aliquod datum, cui nOr-
males lune radii paralleli: quo casu magis ob commoditacem.
quem necellicarem urimur, uc incelligenri Lectori ex sequencibus
Pacebic.
2. apellia
Radios parallelos in uno Diaphano, in unicum punctum datum Dia-
phani diversae densuatis concrecare: Data quoque Conoidis, vel
Spharoidis vertice: oportet antem ut linea ducta per punctum con-
recationis, e verricem datam, sic radiis datis parallela.
Tneprimo radii in Dideran rariore paralleli, R, R, e5 c. COn
andi in Diaphant denlioris punctum F; sirque Sphae-
roidis vereox L; Foco remollele F, e vertice L, tac horum diapha-
LOtaM ellipS densIFaLIS LM A; _ manenre aXC LF A, radiis
dacis pallelo, ex elliples ereumvolutione ac Sphaerois L. M A,
cujus maceria sic ex praedicte maphano dento: dico omnes radios
Ast hat Vcto Pa, (C GuOrU BuMETO LunE R R _C.) in
Spti