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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 105, page id 797435492:0169
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l E C Y.. XV.
id quadantenus hoc modo pertentanres atringetis. Oculi cenerum
(quale dari passim supponitue, ei salteni analogum quid dari videcur;
nec inde, quoad illam, quae pra manibus rem, erroris quicquam
provenier) oculi centrum, inquam, ubicunque pro libitu constitu-
cum ceu punctum radians corcipiatur; tum ex eo duo prodeuntes
radii ad provolitam superticiem (eo quem hujus exigit natura vel pro-
prieras specialis modo) inflectantur. cum inter hos intlexos colloca-
tum incellicatur objectum; ejus certe species inter duos primos ab
oculi centro procedentes radios consictet, quae cum ipro (quond ap-
parencem anguli quancicarem, punctorum correspondencium positionem,
ex reliquas affectiones) objecto comparata roci compotes rosreddet;
_c id quidem perfectius, si exrremorum ac mediorum, pralerrim
objecti punctorum jultas imagines, ex doctrina hactenus tradita:
velicis investisare. ab appolitis exemplis res manifestior eradet; in
quibusnotetur punctum O semper oculi centrum, rectam OB A r2-
diarionis axem (superticiebus intleetentibus perpendicularem, ec objecta
in partes xquales dirimentem) denotare.
Exemp. I. Preponatur Superficies plana medii refringentis den- F18. 169.
foris (aquae siplacet, aut virri) objectum continentis, reluti Super-
fcies a recta MNPrepraesentata. _ ab oculi centro O prodeant urcun-
que duo radii OM, ON; qui in MF, HCiretringantur; inter
tos jam designetur objectum LiAC, (ab axe O A bilectum) hujus e
medio FCM N spectati species (vel apparencia) alicubi consistet
inter rectas OM, O NI, veluri puta ad p a v. cum autem (uE ex hu-
jusce superticiei natura, communique refractionum lese palam est)
sit angulus e Oq major angulo FOC; haec objecti speciem ampli-
ticar infectio. irem cum puneta (sibi respondentia) F, 8; _ 6, y ad
ealdem respectire partesjaceant, ab eadem objecti posito non immu-
catur. quod si punctorum e, a, y policio jurca luperiorem doctrinam
Strictius exquiratur, de corius imaginis pa r figura distantiaque
laris accuratum Feretur judicium.
Exemp. II. PropOvAtHr corpuS densum PMHIC. Superficiebus L1B. 176.
planis paralbelis (M NI, P (2) comprehensum; e ab oculi CenErOO
prodcunces radii OM, O NTad superficiem M N retringantur in MP,
NO; horum vero ad Superficiem P O retracti (InE P F, OC (qui,
propter incidentias (ad MI, P, _ N, () pares, ipsisOM, ON
aequidictabunc) inter P F, OC. Caruatur objectum E AC, cujas sic
imaso par; cum vero manifectum est hic se rem limilicer habere ac
in tisemplo praecedenei.
Exemp.