Full text: Barrow, Isaac: Lectiones Opticæ & Geometricæ

1. Si punctum Z cadat inter C, & K, fac DZ + {I/R} KZ. DZ : :
DK. DY; & cape DY ad partes lentis verſus K.

20.1.

Fig. 152,
153.

2. Si punctum Z cadat extra CK, & ſit inſuper DZ & gt; {I/R} KZ,
fac DZ & gt; {I/R} KZ. DZ : : DK. DY; & cape DY ad partes lentis
verſus K.

3. Si DZ = {I/R} KZ, imago Y infinitè diſtabit.

4. Si DZ & lt; {I/R} KZ; fiat {I/R} KZ - DZ. DZ : : DK. DY, & cape DY ad partes lentis adverſas ipſi K.

De ſenſibiliter autem propinqua diſtantia radiantium ſeu divergentes
radios emittentium punctorum (qualia ſemper deſignat punctum A)
imagines (ut & illæ quas ad ejuſmodi puncta convergentes efficiunt
radii) hoc pacto determinantur.

_I._ Ad lentem plano-planam diverg.

Fig. 154,
155.

_II._ Ad lentem plano-planam converg.

Fiat {R. I : : AB. BZ, & \\ I. R : : DZ. DY.

Breviùs. Fiat I. I - R : : BD. AY.

_III._ Ad lentem plano-convexam diverg.

Fig. 156.

_IV._ Ad lentem plano concavam converg.

Fiat R. I : : AB. BZ. & cum Z cadit

1. Extra DK, ſi {I/R} KZ & gt; DZ; fac {I/R} KZ - DZ. DZ : :
DK. DY; & cape DY ad partes lentis adverſus A.

2. Si {I/R} KZ = DZ; imago diſtabit infinitè.

3. Si {I/R} KZ & lt; DZ; fac DZ - {I/R} KZ. DZ : : DK. DY; & eape DY verſus A.

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