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

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9072 cùm eum tunc reflexi convergentes appellant; & imago diſtinctior Z
poſt
oculum conſiſtat.
quin ejuſmodi complures apparentias obſerva-
bitisipſi
ſi lubet, &
ex his deducetis
XVI. Prætereà, _dato oculi centro, velut O, quonodo deſignandus_
_ſit
ipſum pervadens reflexus_ (ceu N π) è ſuprà tractatis aliquatenus
adparet
.
nec inibi generaliùs expoſitum _Problema_ libet h@c repo-
11Fig. 103.nere.
XIX. AC. AN: : CK. KN.
XX. ACq - ANq. CN q: : AC. CK.
XXI. Radii AR ipſo AN obliquioris reflexus cum axe concurrat
in
L;
erit CK. CL: : ACq - ARq. ACq - ANq. ac indè
XXII. CK & lt; CL.
XXIV. Detur recta BC; in ea protracta deſignandum eſt punctum,
velut
Z;
ita ut BZ ad CZ datam obtineat rationem, puta I ad R.
22Fig. 104. Id facilè ſic exequimur.

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