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# Title: Optica Promota, Seu Abdita radiorum reflexorum & refractorum Mysteria, Geometrice Enucleata (shelfmark Leibn. Marg. 94)
# Folio 25, page id 727094130:0037
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rOp. 16. Problema
Radios parallelos in uno diaphano, ad divercenciam, in alis diaphano
alterius densitatis, ab aliquo puncto dato reducere; dara quoque
Conoidis, vel Sphaeroidis verrice: Oporcet autem nt linea per ver-
ricem, es punctum daum ducta, sit radiis datis parallela.
Ine radii Paralleli in Diaphano rariore a A e c. ita retrin-
gendi, uc appareane divergere ex puncto H; daca quoque Sphx-
roidis verrice M. Foco remoriore N, e vercice M, Rac elliplis 12. Hajus.
densicaris horum diaphanorum I. M R, Q ejus axe N Mimmobili
manence, radiis A, A, erc. Parallelo, ex ejus circumvolutione
describatur Sphaerois I. M R constans ex diaphano rariore; (pa-
cium vero in quo elt
SpharOIS, Conttet ex
diaphano dentiore:
Dico omnes radios
A, A, esc. in SphaerOI-
dis superticiem inci
dences, in iplius Tu-
perticie retringi, de a
Cocon divergore: Sic
enim craciis AABCC.
unus AL, incidens in
Spharoidis supertici-
em in punctol, e
vrodueatur in P, du-
CaCUTqUe COnTIngeNS
Sphaeroidem in puri-
eto L, linea FILG, in
plano ellipseos, Per
exem Sphaeroidis, _
punctum L, cravleuncis, quae ellipls est superticies retractionis, 10 Rujus.
sIEGUe RML; ec ducatur ex puncto N, per punctum conractus L,
linea BI.B: Si igitur Sphaerois LMK, esser diaphanum centius, e
includeretur diaphario rariore, ex quo nunsconttar; runc ansulo
lBCt.
Lan L
a