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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 31, page id 797435492:0055
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E C
I. p D ea jam accedimus qux radiis obveniunt ad planam supertici-
LLem, vel ad rectam lineam, retractis. Quod argumentum eo
diligentius p. osequemur, quia nondum pro merito suo videtur satis ex-
cultum; ut ex quoniam in eo tractando methodum prxestituemus no-
bis, ee qualinormam in sequenribus obserrandam. Ad ren.
II. Parallelorum rectae linex (F P) incidentium radiorum (AB, F18. 3T.
M N) retracti (B ae, N _) sunc etiam libi paralleli. Nam quoniam
AB, MNsunt, ex hypochesi paralleli, erunc ansuli ABB, M N F.
pares. Ieaque retractos habent ansulos pares; horumque comple-
menta (scilicet ansuli a B F, H N F) aequantur, quare liquet retractos
Ba, N u Sibi parallelos esse.
III. Hinc infinire distantis, hoc est parallelos radios emittentis (in-
finitam ad sensum dictantiam incelligo, qualis est quoad hoc Rellx cu-.
juspiam) puncti locus apparens, aut imaso per hujusmodi retractio.
nem effecta infinite quoque distat, quippe cum haec etiam per radios
parallelos adspecretur. Ieaque licus ejus respectu visis ubivis posirifa-
cile dererminatur. Sit oculi puta cenerum O. ex A punctum radians:
immense dilticum; connexaque AO retringentem P P secet in C;
Cirque radii A C retractus a; Per O vero ducarur O BL ad a 6 FIS. 32.
parallela; in hac ad infinitum prorenta (velut ad Z). apparebit pun-
ctum A. Cum enim radii AG, AB sinc (ad sensu) paralleli, exi-
am iplorum refracti erune paralleli. Ouare eum C a sit retractus ipsius
AC, exit BO, ad Ca parallela, etiam radii A. B refraCtuS. Fr∞O
punctum A in recta OB prorensa apparebit.. Ouoad hujusmodi radi
acionem nil suceurrit aliud; itaque de propinquo radiancis puncti sym-
peoiata contemplemuI.
sit punctumradians A, ab F. F haud ad sersum lonse remorum; ab hoc
auterd:
16. 33.