Barrow, Isaac, Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur

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8163
Lect. IX.
II. _Dato circulo reflectente_ (cujus centrum C) _datiſque binis pun-_
_ctis
;
ab horum uno recta ducatur, cujus rtflexus per alterum tran-_
_ſeat
._
1. Si data puncta (puta A, X) ſint ambo in circuli peripheria,
11Fig. 86. manifeſtum eſt biſecto arcu AX in N, connexiſque ſubtenſis NA,
N
X, rectas NA, NX ſibi mutuò reflexas fore;
ſeu, junctâ CN,
angulum
CNXangulo CNA æquari.
2. Etiam ſi datorum unum (X) in circumferentia ponatur; liquet,
22Fig. 87. connexis AX, CX, factóque angulo CXH = CXA, ſore XA,
XH
alterum alterius reflexum.
I. Fiat CK. AC: : CB. T. ac inter CB, & T ſit proportione
44Fig. 8@. media V (unde CBq.
Vq: : CB. T: : CK. AC). tum centro A,
intervallo
:
: ACq - Vq. deſcribatur circulus

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