Full text: Barrow, Isaac: Lectiones Opticæ & Geometricæ

4. Cùm Z cadit inter puncta D, K; fac DZ + {I/R} KZ. DZ : :
DK. DY; & cape DY verſus A.

_V._ Ad lentem plano-concavam diverg.

Fig. 156,

_VI._ Ad lentem plano convexam converg.

Fiat {R. I : : AB. BZ; & \\ {I/R} KZ - DZ. DZ : : DK. DY.

_VII._ Adlentem convexo-planam diverg.

Fig. 157.

_VIII._ Ad lentem concavo-planam converg.

1. Si AB & gt; {R/I} AC, puncta Z, & Y ad lentis partes puncto A
adverſas reperientur, facto AB - {R/I} AC. AB : : BC. BZ. & I. R : : DZ. DY.

2. Si AB = {R/I} AC, imago infinitè diſtabit.

3. Si AB & lt; {R/I} AC; deprehendentur Z, & Y verſus A, facto
{R/I} AC - AB. AB : : BC. BZ; & I. R : : DZ. DY.

_IX._ Ad lentem concavo-planam diverg.

Fig. 158.

_X._ Ad lentem convexo-planam converg.

Si A cadat extra BC, fac AB - {R/I} AC. AB : : BC. BZ; ſin
A cadat inter B, & C, fac AB + {R/I} AC. AB : : BC. BZ; tum
fiat I. R : : DZ. DY.

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