Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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[111.] _Theor_. VI.
Page: 344 (151)
[112.] FINIS.
Page: 344 (151)
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manibus. </
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<
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<
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verit. </
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<
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<
s
xml:id
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xml:space
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">eò ſcilicet, ut locum definiam
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imaginis in dato quovis refracto apparentis; </
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<
s
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illud in his certè caſibus _intricatiſſimum Problema_ (cujúſque Solutio
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nullatenus aut laborem quem exigit, aut temporis jacturam compen-
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ſabit) quo jubetur per datum punctum tranſeuntem refractum deſig-
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nare. </
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<
s
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xml:space
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<
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<
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xml:space
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ginis locum ex hoc uno Theoremate determinamus.</
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<
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<
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<
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xml:space
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<
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rum concipiantur refracti N π, R σ ſeſe puncto Z decuſſantes; </
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<
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centúrque ſubtenſæ NP, N π punctis E, G; </
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<
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xml:space
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">(à rectis nempe CE,
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CG ad illas perpendicularibus) dico rationem NZ ad GZ è ratio-
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nibus CE ad CG (hoc eſt 1. </
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<
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xml:space
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componi.</
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<
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<
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xml:space
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<
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<
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que producetis CE, CG capiantur CF = CK; </
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<
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xml:space
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<
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xml:id
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xml:space
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</
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<
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xml:space
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<
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xml:space
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">per F ducatur TV ad NP parallela; </
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<
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<
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parallela. </
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<
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xml:space
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<
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<
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<
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arcuum indefinitam parvitatem). </
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<
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<
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<
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<
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{arc PS ±: </
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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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<
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NR. </
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<
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{NZ ±: </
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<
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<
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<
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_Num. iI_</
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NR. </
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<
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+ NZ. </
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<
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<
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NT. </
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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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<
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<
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juxta præmonſtrata, arc NT. </
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<
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<
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<
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_Num. 6._</
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quapropter erit AE. </
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<
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</
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<
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<
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+ CE. </
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<
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<
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<
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oſtendere.</
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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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<
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<
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<
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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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<
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<
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