746346

Librorum

PropoGtionum.

q11 .e ex certo

derermm.tto loco

0111nib11s fitis

part1h11s abfol1tta v1deat11r.

453

3 .

faperfu1e co11vexa globi imaginem deformaram

delineare.

454

111 fi1perficie conrex,1 cylindri, imagmem deforma-

t.im

delme,ire.

455

7'í·

fil

ji1pcrjiCte convexa coni, imagi11e111 deformem dr-

lineare.

ibid.

76.

111

pyramide q11adrilarera, in1.1ginem delu1tttre dc-

formem.

ibid.

!W!1!2lt!l!lfilifill.\l~!l:flll!ll!1!2!/:fl!lil!/:fl®!lílf&fil'llt!l,ft!l'!Lll®

O P T

L IB E R II I.

De propagatione luminis.

DIGRESslOl.QVid

fit lt1111e11.

456

•

:z,.

A11 lmnm medii ali11d l11111t11

prod11cat.

459

L111111na

eodem fi1bjello

diverfis age11tih11s pro–

duc1a 11ec

impedirmt, 11ec fa propr.C )ltl•a11t

ad altqtiam allto11em co1111111111em eliciend,1111.

461

4 .

De Opaco,.

Diapbano.

463

; .

fl!!_1d fine

colores~

466

6. Ali

pr.uer lumen

de11t11r ali,,, colo

jpeetcs

1111-

preffe.

467

fl!!_am probabilitatemba/Jeatea fentent'.a qu.1, vifio–

nem per extramijfionem jieri a(fcrit.

.4Tt

PROP. I.

Perpendic1d1tresrttd11 mre1ifi11s, q11a111mcli-

n.1ti pla1111111 i!l11mi11a11t.

. , .

474

:z..

So/e 1¡ii111/s e/evato , terra 11111111s tll11mmatur,

ibid.

p,úfi111t

magü diflans

l11cido 111imls il!1mzinttt1tr.

4-75

4 .

Lumen decrcjéit

i11

proportione d11plicata di.flan·

tittrlllll

l11111i11ofo reciproce.

477

; .

Si duo l11Cl{/a, allt d110 lt1Cidi cj11ftlem p11nlla <1.q11tt–

ltter dijlent

d11obm jpatits, l11mina in illü pro–

duéla fe httbebunt i11 duplicarJ ratione difla11ti.1-

mm reciproce.

471

Si duo jpatia

dttobm l11cidi1 <1.qttttli/,1u <iqualirer

diflent reciproce, <1.qualiter illummmu11r.

ibid.

P11nc11111J jpatii mimls diflans

ltmdo fib1 proptori,

q11a111 ttfi11d ab a/10 lttcido<t.qttttli

)

111.rgis d/111111-

11atur.

478

S1111.tq11alia {int l1111Jinatltl 111inim11111 lumfll i11fir-

1mori propi11quim erit.

ibid.

9. Splu.r<t. 11llivitatis decreftentiam numeris e."<bibere.

ibid.

ro.

Si duo lucida ill 11n11m coaleftant , 11011 ttgent a4

diflantiam duplo 1111tjorem.

479

n .

Aliq11a11do q11od

luminofo 111agis d!fl11bit mim/s

a11t ttqualiter il/11111inabit11r.

ibid.

In /11mi11e folari per exig11111n foramen ira11fi11ijfo,

~fe

bttbent lumi11a pojl foramm prod11ll,a, quoad

i11tenfio11em

111

duplicatJ ratio11e

d~rfa11tiar1111l

fora111111e reciproc<.

48<>

13.

St.

per for11111e11 d1vtfú

•1.le

rr"'1fi•lltt>1tur lumen fo&–

p.rrtes

lrwmw Clrc..z.

axem

roto fo/e

tll111m-

1utJ!

/}(lbent quoad rmenfion.,11 in rat1011e d11-

plrc.tta difl.¡11ttar11111,

11on

rpfa for,r¡ume fad

ab tpfo

fo/e.

'481

r4.

Explte~tto vtrgart~m

in nubrbus.

ibid.

l).

St p1111clum folum radret per foramen, figura lucrs

e¡rccpt«

pl.mo

para/le/o ipfi fe11eflr<1. ,fig11ram

111 •

d11ct 1pfius for.1111ims.

48z.

16.

St.

11111c1111J l11nd1 pm1éf1m1 immeme

forammé

dijl.ms,

per illud radiet, excip1ttt11rg11e comm11

rad1.1tio d11ub11s pi.mis ad e.1111 reéfis, d11JJ figurtt

fimi/es

phyfice «q11ales ge11erab1111t11r.

ibid.

17.

Q!!~

r11d111;fol1trts fer foramen q11odc11111q11e trtt1tf–

nujfi1s in 111.tjori a foramine diflmma, pl.1110 ad

1pji1m reflo exetpiet11r,

11111g1s ad circ11/u111 ac–

cedet.

483

18.

St foramen aliq11aJiti parte tegatur, no1111111tatur

fig1m1 radii

i11

majort difla11ti.i excepN,fed mimls

/11cidus erit, 1111m1bit1tr figur,1

i11

minori d1-

jlantt~.

483

19.

Si corp1u opacmll i11ter foramm

folem oppo1111-

t11r, quod impediat a!tquam ta11t1lm

folu

partcm

m totmnforamen rttdltlre

;

radius in convementi

dtjlanti•< except111

jiguram P•1Tti11m

ad1anmm1

imitabitur.

484

:z.o.

Pa11ciores jimt digiti in fo1is radio per foramen

excepto

quam i11 codo,& 111t1C1tl« 1m11ores appa–

rent quam revera fant.

ibid.

2.1.

Cur radius folariJ per foritmen tra11fi11ijfiu vidca-

tur

i11

loco

umbro.fo,

alibí 11011 \•ideatur.

485

z.:z..

So/is d1a111err11111 vijibtlcm meriri, radio perfora-

mm immijfo.

ibid.

:z.3.

SplN:ra lu111i11ofa opac11. .equalis, ej1u dimidi,1111 par-

tem ill11111inat.

486

:z.4.

Spbttr<t. opac" minoris lucida, pl11fq11a111 hemij)h<t.–

rium i/111111inat11r : pars vero fttcid<t. ilf11111111ans,

111inor

ejl

bemijpb<t.rio.

ibid.

20.

Sph

<1.ra

l11minofa 111.ijor, opac.t minori propior, ma–

jorem ejus parrem illtm111lat, q11am

remorior

ejfet.

487

2.6.

TotJimt 11mbr11. cjufilem corporis opaci q11ot lu1td11.

íbid.

27.

Umbra corpori opaco propmquior, ex accide11t1porcjl

fieri obflurior

apparer t1t11ie11 fen1per ohfl11-

r10r.

488

28.

Lme.e oppofit<t. direllC lucido indivifibili umbra

ejl

linea injimta: obl1que erit ji1perficies cttam mfi111·

ta ,jirperjiciei direélC OP.fofir.1,, umbra

ejl

fi1per–

ficies item infinita

oblique oppojiu

ejl

figura fo–

lidtt.

ibid.

:z.9.

'Umbra totalis corporis jpb.1,ríci .eq11alis lucido

JPb<1.r1co' 11011 augetllr,

489

30.

Opaci jpb.1,rici lucido jpb.trico majoris 11mhra ro–

ta/is femper creflit, mi11ons femper 111i11or evadtt.

ibid.

31.

Umbra totalis ji1perficiei alicuj111 except.e p/11110 ipfl

para/lelo, 11011

ejl

famper jig11r.i:fi111ilis1

4-.9°