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

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page |< < (94) of 393 > >|
XXVI. Subnectam & ab amico communicatam (aliâ methodo
11Fig. 147. repertam ab ipſo, concinneque demonſtratam) conſtructionem:
Duc NR incidenti AN perpendicularem, & ſecantem axin in R.
Fac
NP.
N π : : NR. T. duc N Qrefracto NK perpendicularem,
&
æqualem ipſi T; denique jungatur QC; hæc producta ſecabit
NK
in foco quæſito Z.

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