Barrow, Isaac, Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur

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Lect. VIII.
I QUæ radiis obveniunt à longinquo puncto manantibus, adc-
óque quaſi parallelis, ex reflectione peripheriam ad circula-
rem peractâ;
ubinam & quouſque vel ſibimet ipſis occurrunt, vel ax-
em interſecant;
quo loco radians oculo ubicunque conſtituto repræ-
ſentant, in poſtremis eſt diſſertatum.
ad punctum jam accedimus ra-
dios ejiciens ſenſibiliter divergentes.
Et hujuſmodi quidem puncto,
quanquam ſeu in obverſas circuli Convexas partes ſeu ad concavas
radiet communia pleraque ſymptomata conveniunt;
tamen communi
fretus _Opticorum_ exemplo, præſertímque majoris evidentiæ causâ,
caſus iſtos diſtinctè proſequemur;
illum fuſiùs imprimis, hunc aliquan-
to conciſiùs.
ad rem.
II. In circuli BNP (cujus centrum C) convexum à puncto A
quilibet incidat radius AN, íſque reflectatur in NG;
patet reflex-
um GN productum axi AC occurſurum.
nam ductâ CNE patet
GN productum angulum ANC ſecare;
nec non ideò trianguli
ANC baſin AC;
puta in K; quo poſito.
III. Dico fore AC. AN : : KC. KN. Nam ducatur KH ad
CN parallela.
eſt igitnr ang. KHN = CNP = CNK = NKH.
hoc etiam è ſuperiùs generatim oftenſis conſectatur. adeóque NH
= NK.
itâque cùm ſit AC. AN : : KC. HN. erit etiam AC.
AN :
: KC. KN.
IV. Corollarii loco notetur (ductâ CP) fore NH = NK;
& triangula HNK, NCP aſſimilari; vel eſſe HK. HN : : NP.
CN.
V. Porrò, conftantibus iiſdem, dico fore AC. KC : : ACq
- ANq .
CNq. Nam eſt NP. CN + AN. CN = HK.
HN + AN. CN = HK x AN. HN x CN = AN.

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