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# Title: Optica Promota, Seu Abdita radiorum reflexorum & refractorum Mysteria, Geometrice Enucleata (shelfmark Leibn. Marg. 94)
# Folio 27, page id 727094130:0039
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roblema
Radios in uno diaphano, ad unicum punctum daium corvereentes, ad
parallelismum in alio diaphano diver sae densiraiis redicere; data
quoque Conoidis, vel Sphaeroidis verrice.
Oc Pron d convertum quoque anrecedentis, eocemque
modoTolvitur; uc patet ex Prop. 9. lib. 20. Vicellionis.
Corolarium.
Ex de icens est, radios ad punctum aliquod prope N
convervenres, ad parallelimum reduci quo ad sensum, Conoide,
vel Spheroide L. Mt R.
Scholium.
Tud m esue loguuer unus de unica cancum refractione, quae AC
in superticie Conoidis, vel Sphaeroidis; nunC verO lOquiMUE
de duplice retractione lencium (una tic in radiorum incidentia,
altera inradiorum emertione) quae extructis Conoideon, vel Spha
roideon conponuntur, ea(dem semper concluliones demonstrando,
e in speculis, ex in lencibus; uc appareac admiranda Flarmonias
inter Cacoprricam, et Diopericam.
op. 10. Problema.
Radios parallelos, in unicum punctum darum ejusdem diaphani concre-
eare; datis quoque bontis vel speculi verticibus: oporret tamen,
nc linea ducta per vertices lentis, vel speculi, es punctum concursus
sit radiis daris paralteta.
Catoperise.
L la actel L286. I Cait Pulcit eide
e verrex speculi. toce La errice A, hroc lpeculumm
Pacabee e MLC; OCoOHesacios leKb. II
hoc speculum incidences rellecti in iptius focum E. Sic enim M
punctum
egadi.