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# Title: Optica Promota, Seu Abdita radiorum reflexorum & refractorum Mysteria, Geometrice Enucleata (shelfmark Leibn. Marg. 94)
# Folio 29, page id 727094130:0041
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Op. 19. Problema.
Radios ex unico puncto dato diverrentes, ad parallelismum reducere,
in eodem diaphano; datis quoque lentis vel speculi verricibus: Opor-
tet antem, ut vertices lentis, es punctum divercentiae, sint in eadem
recta linea.
Oc Problema est convertum anrecedentis, eodem que modo
 Perticicur; uEPatet ex Prop. 9. lib. 10. Viellionis.
Corollarium.
Ex hoc etiam sequitur, radios divergences ab aliquo puncto
circires E, heri Parallelos opelentis, vel speculi surradieti.
FOp. 20. Problema.
Radias parallelos; ad divercentiam in eodem diaphano a quocunque
puncto dato reducere; datis quoque lentis, vel speculi verticibus:
Oporiet tamen, ut recta per vertices, es diversentia punctum ductas
sit radiis datis parallela.
Catopiilb.
Incraciiparalleli A A e c. ica refectehd, uc appareone diver-
si e puncto
B, Cirque data spe-
culi vertex I. Ver-
cice L, e FocoB,
delcribacur specU-
lum parabolicum
CONVENUI MLR,
incercipiens radios
parallelOs AA e c.
quos radios in su-
perticiem ML R
incidences, dico in
ola