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# Title: [Lectiones XVIII, Cantabrigiae in Scholis publicis habitae] Lectiones XVIII, Cantabrigiæ in Scholis publicis habitæ (shelfmarks Leibn. Marg. 0; ZEN Leibn. Marg. 0)
# Folio 10, page id 797435492:0026
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 a
dios diverto medio oblique incidentes, velur experimur, inflecti; fal-
tem eo spectantia lucis praecipua sympromata, tribus porro subjiciendis
hiypochelibus compreliensa, rix aliâ ratione commodius explicari.
XI. 4. Omnis radii lucidi inflectio (hoc subinde generali nomine.
compendiicausa, cam refractionem, quam reftectionem complector)
tic in superticie ad medii inflectentis superticiem perpendiculari, seu
recta. Fhujusce suppolitionis haud ullam Facile latis commodam et
claram rarionem reperias apud Opricos; pecitione principii, vel in-
comprehenlibili quadam obscuritate laborat quicquid terme eo spectans
atterunt; neque ralde miror radium lucis semper ut rectam concipien
tibus individuam lineam id eis accidille; quo polico rix probam ullaim
ejusce rei cansam altionari posse credo. Cadat enim radius lincaris
AB in speculi (instantix gratia) plani sux exticiem ad punctum B; Per
GuOd VECINGNE duCanTuF dIIX RECtX C D, E F; cum igitue rectae A B.
CD sinc in uno quodam plano, quidni reflectio radii perassatur in ilto
plano? Similiratione quoniam recte AB, P F sune in uno plano.
quidni radius in hoc erium refectionem pariutur? Codemque plane
modo quid obstat quo minus in lingulis omnibus, hoc est infinitis
planis, speculi superticiem secantibus, _ per rectam AB ceu com
munem sectionem traductis perticiatur reflectio, idemque proinde ra-
dius unus in partes undique cunctas reflexus dispersatur? cur hoc fieri
non possit, utiquenon capio. Ouod respondetur enim, polito plano
ABC ad speculi superticiem recto magis illud planum, quam Cxtera
quaeris speculi superficiei contrarium essle, proinde relistentiam in
eomaximam continsere, proptereaque radium in eo porilimum in-
Aecti, Pariu Patistacie; quoniam, uc Cuperius insinuatum, extra
punctum iplum B, cui radius impinsir, alia nulla specularis superticici
pars meriro venit consideranda quid enim. (ut hoc adjiciam pradictis
an in unirerlam qua lonse laceque distenditur, iplius speculi superti-
ciem asir hic lincaris radius, _ ab ea vicissim pacitur; an in ejus desi-
nitam aliquam partem agit, patiturque ab hac: Quis in FOram agere.
vel a tora pati concedet? Ec cur id uni parti depurandum prae aliis 
ubi terminis figetur ? quousque proceder operatio: quinimo porius,
quia radii per rectam A B procurrentis impultui rancum id speculi quod
est in recta A B verlus C protracta relistir, ideo pullus in iptam AB
rejicietur; Et nulla succurrie caula Pontica, proprer quam aliortum
deflectat: nihil datur, quod ejus cendentiani alio determinet. Igieur
ut aliis, guxe puto rarixe altignantur, hujus effecti causis excuciendis
abscineam, inde genuinam ejuleerationem (u ec generatim omrium
G1IX