Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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dios diverſo medio obliquè incidentes, velut experimur, inflecti; </
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tem eò ſpectantia lucis præcipua ſymptomata, tribus porrò ſubjiciendis
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hypotheſibus comprehenſa, vix aliâ ratione commodius explicari.</
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<
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compendii cauſà, tam r@fractionem, quàm reflectionem complector)
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fit in ſuperficie ad medii inflectentis ſuperficiem perpendiculari, ſeu
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recta. </
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<
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claram rationem reperias apud Opticos; </
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<
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">petitione principii, vel in-
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comprehenſibili quâdam obſcuritate laborat quicquid fermè eò ſpectans
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afferunt; </
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">neque valdè miror radium lucis ſemper ut rectam concipien-
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tibus individuam lineam id eis accidiſſe; </
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">quo poſito vix probam ullam
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ejuſce rei cauſam aſſignari poſſe credo. </
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A B in ſpeculi (inſtantiæ gratiâ) plani ſuperficiem ad punctum B; </
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quod utcunque ducantur duæ rectæ C D, E F; </
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C D ſint in uno quodam plano, quidni reflectio radii peragatur in iſto
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plano? </
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">Simili ratione quoniam rectæ A B, E F ſunt in uno plano,
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quidni radius in hoc etiam reflectionem patiatur? </
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modo quìd obſtat quo minùs in ſingulis omnibus, hoc eſt infinitis
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planis, ſpeculi ſuperficiem ſecantibus, & </
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munem ſectionem traductis perficiatur reſlectio, idémque proinde ra-
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dius unus in partes undique cunctas reflexus diſpergatur? </
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non poſſit, utique non capio. </
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">Quod reſpondetur enim, poſito plano
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A B C ad ſpeculi ſuperficiem recto magis illud planum, quam cætera
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quævis ſpeculi ſuperficiei contrarium eſſe, proindè reſiſtentiam in
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eo maximam contingere, proptereáque radium in eo potiſſimùm in-
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flecti, parùm ſatisfacit; </
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">quoniam, ut ſuperiùs inſinuatum, extra
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punctum ipſum B, cui radius impingit, alia nulla ſpecularis ſuperficici
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pars meritò venit conſideranda quid enim (ut hoc adjiciam prædictis)
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an in univerſam quà longè latéque diſtenditur, ipſius ſpeculi ſuperfi-
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ciem agit hic linearis radius, & </
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nitam aliquam partem agit, patitúrque ab hac? </
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vel à tota pati concedet? </
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</
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<
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quia radii per rectam A B procurrentis impulſui tantùm id ſpeculi quod
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eſt in recta A B verſus G protracta reſiſtit, ideò pulſus in ipſam A B
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rejicietur; </
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deflectat; </
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ut aliis, quæ puto variæ aſſignantur, hujus effecti cauſis excutiendis
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abſtineam, indè genuinam ejuſce rationem (ut & </
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