Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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CAN = ang. </
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<
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<
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2 ang. </
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<
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<
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ſunt.</
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<
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<
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<
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procurrentes à ſe divergere; </
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flexum oculi centrum tranſire; </
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nam à convexo ſpeculo imaginem exhiberi.</
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<
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que ſit A. </
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B. </
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ſin. </
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<
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(circulíque convexâ parte comprehenſi) ſibimet æquales arcus NR,
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R X; </
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&</
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diculares NE, RF, X G; </
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ducantúrque ſubtenſæ NR, RX. </
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RX = NR, erit RQ &</
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&</
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CG atqui eſt ANq = ACq + CNq - 2 AC x CE. </
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<
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= ACq + CNq - 2 AC x CG. </
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<
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2 CNq - 4 AC x CF. </
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<
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<
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<
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<
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<
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ANq + AXq &</
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<
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<
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<
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= 2 ACq + 2 CNq + 2 AC x CE + 2 AC x CG. </
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<
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2 ARq = 2 ACq + 2 CNq + 4 AC x CF. </
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<
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poſitum.</
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<
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<
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