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# Title: Optica Promota, Seu Abdita radiorum reflexorum & refractorum Mysteria, Geometrice Enucleata (shelfmark Leibn. Marg. 94)
# Folio 37, page id 727094130:0049
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une, Manifeltum est in Dioprricis, Conoideon, et Sphxroideon
porriunculas, ica in lentibus connexas esse; uc axis lentis (IC CO-
munis axis urriusq; porriunculae, et verrices leneis porriuncularum
Vertices.
Manifestum 2.
Secundo, Manifectum est in omnibus horum problemarum reso.
lucionibus Diopericis, e Corollariis; radios extra lenrem vel pa-
rallelos, vel ad unum punctum convergences, vel ab unico puncto
divergentes; intra lenrem semper ese parallelo5.
PIO
0
26. Theorema.
Si duo Radii, in eodem enm axe plano, incidant in speculi verticem,
ex ab ea reflectanur; erit anculus a radiis incidentibus, aequalis
angulo aradiis repereussis.
Inc duo racii BM, CM, in eonem cum axe plano, incidences,
inspeculi RM L, verricem M, e reflectentur in C, e P:
Dico angulum B M C, a radiis incidencibus comprehentum, esle
aequalem an
BulOPMC, a 2d
radiis resteris
comprehento.
Sic speculi axis
AM, e quo
Diam BMI, C
M, Pune in eo-
dem cum axe
Plano, cricillis
ura, ee Cadem
Superkcies re-
Aectionis, F-
Gura nempe
RMC, ex cujuS
revolucione
henirum est
(0. RH)S.
veculum: