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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 96, page id 797435492:0152
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249
5O
E C
I. Cub praecedemis calcem, Reculam pollicebamur, exemplis stipa–
tam, ex qua punctorum e variis instectionibus resultantes, ima
eines dienoscantur. illam nunc extibemus quam simplicime conceptam.
Sic A B F FO radius principalis, puncti radiantis A speciem per
oculi centrum O deferens, ex incidence primo AB, et inAexis BF,
E F, FO (in directum aut secus dispoliris) constans; tum puncti A
respectu oculi in recta B F positi, _ ex inflectione ad suxerficiem B
resultans (epraemissis utique desionabilis) imago (IFZ. icem hujus Y
(quod jam reluti radians concipiatur) respectu oculi in recta FL
constiruti, ex ab inflectione ad superticiem P emergens imaso (ICY:
denum puncti Y (ranquam in superticiem P radiantis) respectu oculi
in FO collocari siE imaso Z. erit hoc punctum Z imaco cunctis ab
tuis inflectionibus proveniens. neque secus quorcunque fuerint inflecti
ones sele res trabebit; enimvero semper ex iliatali postrema infectione
relultans imago, eadem erit cum illa, quam omnes extribent.
Flujus eftari veritas e constructione Patis apparet; e qua Facile colli-
sicur proximorum ipsi AB incidentium hinc inde radiorum inAexos
eandem circa punctum Z ipsum F Z interlecare. vel ita rem collegeris:
punctum Z est puncti Rimago; _ punctum Y ipliusZ; denuoque
punctum Z iplius Z; itaque punctum X iplius R imago erit, qualem
nempe restic ferr, remota. Scrictiore lonsiusculo discurlu posset hoc
comprobari, sed quortum rem latis claram intricare ?
II. Exempla jam, qua diri, seu e praemissis deducta consectaria
subnectam. Noretur autem imagines, quae in iis proxonuntur delig.
nanda, oculum respicere Centrum habentem in ipso radiarionis axe
(qualis est recta. BD) constiturum. item diverlarum superticierum
ac radiacionum axes libimet in directum voni. pexelumatur etiam in
retractionibus ex aere factis ad vicrum Fore L. R:: 5. 3; ad aquam
vero Fore l. R:: 4. 3. Chae nempe ratiores veris probo congrux
depre