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

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VI. Angulo incidentiæ majori major convenit angul@s inflectionis.
Quoad refiectionem, res extra dubium evidens eſt; angulus enim refle-
ctionis
incidentiæ majori conveniens eum planè continet, qui minori
incidentiæ
reſpondet.
Pro refractione vero: ſit recta QBP refrin-
genti
perpendicularis;
incidant autem radii ABG, DBH (ſcilicet

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