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 |< < (74) of 393 > >|
Not. ductâ AQ ad CB perpendiculari, ſi AE = AN; erit
AN
= {AQ q/3}.
Nam AQ q = AP x AN = 3 AN x AN = 3 AN x AN
= 3 ANq;
itaque punctum N, iſtos caſus diſterminans, facilè de-
11Fig. 106.ſignatur.
A Catoptricis jam aliquando manum. quæ contentus ità quadante-
nus
promoviſſe, haud diſparia (certè magìs nova, miniméque pro-
trita
) circa refractiones ſphæricas, ſeu circulares, attentabo.

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