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

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11597 deprehenduntur). addo, confuſionis evitandæ causâ ſymbolum I
dehinc in his exemplis perpetuò majorem proportionis refractiones
dimetientis terminum denotare, quocunque de medio in quodcunque
peragatur refractio. porrò, medium primum infringens perpetuò
denſius intelligatur rariori circundatum. item, in figuris appoſitis
litera C denotat centrum anterioris circuli, K centrum poſterioris;
& B verticem anterioris, D verticem poſterioris; denuò deſignat Y
locum imaginis quæſitam.

Hiſce præmonitis, primum de longinquo radiantium, ſeu paralle-
los ejicientium radios punctorum imagines, pro lentium varietate, ſic
determinantur.

_I._ Ad lentem plano-convexam.

11Fig. 151.

_II._ Ad lentem plano-concavam.

Fiat I- R. R : : DK. DY.

_In Vitro_ eſt DY = {3/2} KD.

_In Aqua_ eſt DY = 3 KD.

_III._ Ad lentem convexo-planam.

22Fig. 151,
152.

_IV._ Ad lentem concavo-planam.

Fiat {I - R. I : : BC. BZ; & \\ I. R : : DZ. DY.

_In Vitro_ DY = {3/2} BC - {3/5} BD.

_In Aqua_ DY = 3 BC - {3/4} BD.

_V._ Ad lentem convexo convexam.

33Fig. 152.

_VI._ Ad lentem concauo-concauam.

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

_Coroll._ Adintegram Spharam.

Fiat 2 I - 2 R. I : : CD. CY.

_VII._ Adlentem conuexo-concauam.

44Fig. 152,
153.

_VIII._ Ad lentem concauo conuexam.

Fiat I - R. I : : BC. BZ. &

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Scan	Original
101	83
102	84
103	85
104	86
105	87
106	88
107	89
108	90
109	91
110	92
111	93
112	94
113	95
114	96
115	97
116	98
117	99
118	100
119	101
120	102
121	103
122	104
123	105
124	106
125	107
126	108
127	109
128	110
129	111
130	112