Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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<
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. VIII.</
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<
s
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xml:space
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">I QUæ radiis obveniunt à longinquo puncto manantibus, adc-
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óque quaſi parallelis, ex reflectione peripheriam ad circula-
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rem peractâ; </
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<
s
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xml:space
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">ubinam & </
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<
s
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"
xml:space
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">quouſque vel ſibimet ipſis occurrunt, vel ax-
<
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em interſecant; </
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<
s
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echoid-s3267
"
xml:space
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">quo loco radians oculo ubicunque conſtituto repræ-
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ſentant, in poſtremis eſt diſſertatum. </
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<
s
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xml:space
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">ad punctum jam accedimus ra-
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dios ejiciens ſenſibiliter divergentes. </
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<
s
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"
xml:space
="
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">Et hujuſmodi quidem puncto,
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quanquam ſeu in obverſas circuli Convexas partes ſeu ad concavas
<
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radiet communia pleraque ſymptomata conveniunt; </
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<
s
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xml:space
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">tamen communi
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fretus _Opticorum_ exemplo, præſertímque majoris evidentiæ causâ,
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caſus iſtos diſtinctè proſequemur; </
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<
s
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"
xml:space
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">illum fuſiùs imprimis, hunc aliquan-
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to conciſiùs. </
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<
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<
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<
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<
s
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xml:space
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">II. </
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<
s
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xml:space
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">In circuli BNP (cujus centrum C) convexum à puncto A
<
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quilibet incidat radius AN, íſque reflectatur in NG; </
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<
s
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"
xml:space
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">patet reflex-
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um GN productum axi AC occurſurum. </
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<
s
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xml:space
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">nam ductâ CNE patet
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GN productum angulum ANC ſecare; </
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<
s
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xml:space
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">nec non ideò trianguli
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ANC baſin AC; </
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<
s
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xml:space
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">puta in K; </
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<
s
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<
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</
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<
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<
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<
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xml:space
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">Nam ducatur KH ad
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CN parallela. </
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<
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">eſt igitnr ang. </
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<
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xml:space
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">KHN = CNP = CNK = NKH.
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</
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<
s
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xml:space
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">hoc etiam è ſuperiùs generatim oftenſis conſectatur. </
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<
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">adeóque NH
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= NK. </
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<
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">itâque cùm ſit AC. </
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<
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<
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<
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<
s
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">erit etiam AC. </
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AN :</
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<
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<
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<
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<
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CN.</
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<
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<
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<
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- ANq . </
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<
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<
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<
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</
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<
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<
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