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

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10688
Nam erit tum CA. CR = CA. CK + NK. NA. unde, com-
munem
utrinque adjiciendo rationem CK ad CA, erit CK.
CA
+ CA.
CR = CA. CK + CK. CA + NK. NA. hoc eſt
CK
.
CR : : NK. NA.
Notetur in figuris ſequentibus eſſe perpetuo CA. CR : : I. R.
11Fig. 130,
131
.
quod ſemel, brevitatis causâ, monitum efto.
IV. Hinc conſectatur; primò; Si fuerit AN & gt; CR, quòd re-
fractus
N _a_ cum axe AC prorsùm excurrens conveniet.
Nam erit
22Fig. 129. CK.
AN & lt; CK. CR : : NK. AN. adeóque CK & lt; NK.
V. Secundò; ſi fuerit AN = CR, refractus N _a_ ad AC pa-
33Fig. 130. rallelus erit.
Nam ſit NH ad AC parallela. quum itaque ſit CA. AN : :
(CA.
CR : : ) I. R; erit AN ipſius HN refractus. ergò viciſſim
N
Hipſius AN.
VI. Tertiò; Si fuerit AN & lt; CR, refractus N _a_ cum AC
44Fig. 131. retrò conveniet extractus.
Erit enim tunc CK. AN & gt; CK. CR : : NK. AN. ac indè
CK
&
gt; NK.
VIII. Subnotetur autem ſi fuerit ſaltem AB = CR; axi propio-
res
radios in ſenſibilem paralleliſmum refringi.

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