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

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Lect. XVIII.

I. P_Ropoſitum eſt jam nobis rectæ lineæ ex refractione prognatas. ad_
_circulum imagines aeſignare_;
nempe primùm abſolutas;
quorſum hoc ſpectat I heorema:
Nam (è præmonſtratis) eſt FC x MZ. FM x CZ : : I. R: :
CA.
CR. hoceſt FC x CM + FC x CZ. FC x CZ - CM
x CZ :
: CA. CR. quare (ducendo in ſe extrema, mediáque)
eſt FC x CM x CR + FC x CZ x CR = FC x CZ x CA -
CM x CZ x CA = FC x CZ x CA - CM x FC x CX (quoniam ſcilicet eſt

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