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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xml:space
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<
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<
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xml:space
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">_Proponatur circulus ſpecularis concavus_ M B N, & </
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">Fig. 171.</
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radiorum OM, ON reflexi ſint MF, NG (ſe decuſſantes in H, & </
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cum ipſis OM, ON concurrentes punctis X, Y) inter hos collocetur
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objectum FAG; </
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<
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">ejus itidem imago rectis OM, ON interjacebit,
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puta ad φαγ. </
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<
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xml:space
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">comparando jam angulos apparentes FOG, φ O γ,
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clarè vides objecti FAG ſpeciem imminui. </
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xml:space
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reſpondentia F, φ, & </
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<
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">G, γ ad alias ac alias partes jacere, ſeu objecti
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ſitum hinc inverti. </
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">Quòd ſi intra angulum & </
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<
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">ſpatium X H Y ſtatui
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concipiatur objectum, clarum eſt hinc ejus quidem ſpeciem ampliari,
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ſed adhuc ſitum inverti. </
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<
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itidem invertetur ſitus, at quantitas non immutabitur. </
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<
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angulum NHM conſtituatur objectum, puta R L S; </
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<
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ſit ρλσ; </
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">evidens eſt hujuſce ſpeciem creſcere, ſitúmque retineri.</
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factiſque ſimiliter ac in eo quod immediatè præceſſit omnibus; </
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plura prodigam verba, vides objecti F A G ſpeciem. </
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arctari, ſed ejuſce poſitionem eandem perſiſtere.</
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_convexa)_ MBNQP. </
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refringantur in MP, NQ; </
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refringantur in ipſos PF, QG (ſeſe decuſſantes in H, & </
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<
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OM, ON concurrentes ad X, Y) vides jam in prima ſigura, ſi ob-
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jectum FAG infra XY (verſus H) ſtatuatur, ipſum ab imagine
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φαγ majus, quàm obtutu ſimplice, repræſentari. </
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puncta X, Y ſubintelligatur collocatum, ejus quantitas neutiquam immu-
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tabitur. </
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<
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conſpicua, diminuetur; </
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poſitio directa permanebit.</
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<
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rentes convergunt) cùm objectum FAG citra punctum H ſumitur,
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vides ejus ſpeciem quantitate adauctam, at ſitu non mutatam. </
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objecti _RLS_ ultra concurſum H poſiti imago ρλσ nedum protorypo
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major eſt, at quoad ſitum etîam eidem in verſa.</
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<
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">Et hoc quidem pacto nulla non lens pro varia vel objecti vel oculi
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poſitione, objecti ſpeciem aliam exhibet ac aliam; </
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contrahit; </
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nonnunquam longiùs amovet. </
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hoc ad ſpecimen aciem mentis intendendo.</
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