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Liber

Il

68¡

DIOPTRIC

E

s

LlB E R

S

ECUNDUS.

Vari~ .

fpecillorum combinationes;

'1'li~·~.,;u

N Jitperiori libio refraéliomem

!egp

commrmes tradidim11s

;

proprietatefqúe,

e§;

arcidentiaC4rporum; q11ibus communmr ad detorquendos radios jt1'!'a»dámtj11e

vijionem utimur, explimim111, Ea tamen corpora ut falitari'e

&

feorjim fom–

pta conjideravimus

,

neque adh11c inq11ijivimrts quam vari'e

detOT1JUerent11~

r11d1i, d11m ab

11~a

Í¡¡

a/idm /entem jive cavam, flve convexam inciderent;q11id

tn

ow/o pr.eflarent. dum vari'e detorti,in i//am impingerent, q11tt omnia

Jibi

vendicat hic tiber;

ex¡licanda,

,&

enr1c/e11nda minutitlsjiiféip1t.

fl.fM~

lll"ll,!Z!!OO!!ilOOIJIJ!íi!!Z!!!l!l®!1!11ft!!l!lllID1.!H1.llg;¡¡l1.!lllft

PROPOSITIO

l.

Si

!m1

ronve>.·a poft alteram ante p1méf11111 concttr–

.slu foci adhibeatstr

,

accelerAtur tonrnrfiu pe–

nicillornm,jitque imago diftillila objeéforum di–

jl4ntium minor.

S

int duz lentes

AB

,CD, per quas idem obje.

él:um radiec; voco autem objcél:um rcmocum,

quod 1mgis diíhc

a

prima leme, quam

¡¡~

ejus

fo–

cus; dico quod

li

lens AB exprimir imaginem ob.

jeél:i KL

in

FB , hoc eft,

li

in F

tic

unio radiorum

ad punél:um

L

penlnencium,& radiorum

ex.

pun–

élo

K

ptodeuncium in E , ica ut ooralis imago

lic

EF , fore

ur

adhibica alía lence convexa inrer

All ,

&

EF;

cicius fiar unio pcniciltorum,

&

ima–

go diftinél:a

íir

in GH mulro minor qllam

FE.

CWI

D

ir

G

l'

E

Demonci:ratio. Radii ex punél:o

K

prodeunte~

vi prima: lentis convecgunc ad E,po!l: lemcm AB,

Ítem

qui ex

L

procedum,tendunc ad

F,&

lic

con–

ve~genrcs

inciclurit

In

lencem CD , ergo propills

umenrar irt aiiqudfadio per centrum Ucncis CD

t~anfeume,

&

hoc

(per coroll.

,i.)

ergo pro–

pms fic concucfus penicillorum quod erat primum,

~ia

aucem ille radiorum concurfus

lit

in iis ra–

di1s qui cranfeunt

pef

cencrum' ant verticem

l,

erir imago· miuor

uc

GH ;_

quod em dcmon-

fü¡¡mdum..

·

!l!l'1.!6ll"ll·llllOO!lll!!lll'tf.!!!l!lí1llltlll'l!OO!!lJ'!l1lstílltl!lt.!~1lMll

PROPOSITIO 11.

Theorema.

In rodem cafa, q110 mttgi.facuntÍ4 lens rtmovébitur

a

prima' to majar erit imago; fed fornper

mi~

nor

q11am

q11~

per fa/am primam /emem exhi–

bererur.

Sir lens ÁB,qme

li

objicéremr objeél:o diffird;

rcprzfemarcr pamm ejus aliquam in punétb

G.

'

Ji

e

o

.n

E

.1

F

e

N

clic.o

¡¡

alia lens convexa intcr punélum

&

lentém

AB

ftacuatur, quo longius

a

leme

All

diftabir

uc

in

EF,

eo major erir imago. Nam

li

lit

in CD;

lit

radilts HOG per centrutn ejus magnicudinis,

incidens,qui

ferc

irrefraél:us crir. (Jnianturque

i~

cjus punél:o K reliqui radii, erirque punél:um

~ '

locus imaginis illius objcll:i , qui reprzfentacur

in punélo

G

vi

folius

primz lemis. Sit jam lens

in EF , eft alius radius qui tranflt per

cenrru~

magnitudinis lcntis

EF

nempe radius

BIG,

&

iri

eo unientur rdiqui omnes

>

uniantur

in

pu~éld

M.Cum fempec

lit

eadem lcns qua:radios iim1luer

convcrgcnces unit in eadem diftantia , crunt

IM,_

KO

aut zquales, aut proxime z.quales : Íed. (

rr

16.1.)

angulus MIN

maj~r

eíl: mrerno GO;

1g1~

tur punll:um

M

magis d1ftar ab axe

HN ,

quam

punétum

K.

1dcm probabo f'.ac.ilc in

q~olibec

penicillo ex afü. parré ?ofiro; 1gu:ur tota

.•mag~

qua: cxpr•imicur

adh1bir~

lenre

~~

, ma1or eíl:

quam ea qua: cxprimerecur adhibua lente Co.

uu:aque ramen minot e!l quam qua:

i

Cola lencc

J\;!3·proccderer;uc patcr;

C:O~OÍt