icione hac propoficione facla etiam anguliA BD & DBC funt asquales Cric per axio. i. primi Eucli. ctiam tocus Ahp-ulusDBE asqualis coti DB F. Acque ica per defin. lo.primiEudiJinea D B eric ng-ceikrio perpendicularis. Ergo cum linea DB a puncfoincidentiaseducta fieadpianam corporis refleclentis… … ..,
Optics, Geometrical · Optical instruments
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