763 / 798
Liber
l1fl1ltilln!Jllll!l1l8ill!1l1lll1l1íli·1J1Níl!l1fll1fl@llf!1Jllllll!1:!llllJ:W
PROPOSI'FIO
V.
Theorema.
Si objeíltim
Jir
P"r11llelum fl1perficiei corporú re–
fringattiJ
&
ocultu ji1mt in
perpwdiculari
dufJ•
a
medio ob¡céH
ad
/i•ptrficicm
illi11s
corport;
,
imago ob¡eéli major apparebit ob–
jefJo
&
propiol'.
1
Sir fuperficies diapha1ii dc11fiori's A B firque
A~H
B
E
F
C
D
G
objeél:um CD illi fuperficiei parallelum, firque
II l.
73)
Jec~~~i'nª~e;Jec~dic.ulari
G H .duél:a
a
medio ob–
rimrum maju;. fic1cm
AB'
d1co ob¡eélum •ppa-
h Demonft'.ª
1
.io. Punél:um C apparebit in ca-
~ et~
11
:~~rp~cf; ~n~'
&
in lo_co alciori quam
fi
P
.
.
P
0
E. •
pattter pu11élum
O
peél:ab1cur
1n
F; ergo ªl'Pª«ntia objcéli C D •
em.
E .F,
fed
E F
fpeétatur fub angulo
E H F,
~a¡or~
;.
qua~
lit
CH
D;
ergo maius videbitur
In
rah
d.1fpoqc1~11e
objeélum per refrafüoncm,
quam d1reél:e v1derccur, quod erar demoni\ran–
dum.
Q_u:z: demonílrario u11iverfalior fieri poífet,
fi
nemp.e
~on
ra11rum
~cul~s
eífer in ipfa pcrpendi–
culan linea , fed euam
lll
plano ad lineam
e o
reél:o; quia in bis calibus femper linea EF,Ípeél:a–
b1rur majar quam CD. Q.uare in om11ibus
fcrc
cafibus apparer objellum inrra aquam immerfmrt
paulo majus. Non perfequor omnes cafus, quia
ur oll:endi principium qno nirurimr 11011 cll: ita
inconcuffum , ur aliqua experienri:z: 11011 conrradi–
cam, quid vero in c:z:reris corporibus
pr:z:cipu~
fpha:ricis •ccidat, ex aliis principiis Catis foperque
demon!haviml\S.
SVPPOSITIO
Ad naturam refraétionum coloratorum
explícandam.
ATE R l A M 11ggredim11r diflicillimam, faltem q1111mdi11 in principiis phyficii
ver(dbim11r
,
fJttd! q11idem mathcmaticU1 int11{/a pojfet omitme
,
Jitppojitifq11e
11/rqttib@ experientiis , ttÍleriru progredi ,
&
ea tantum 11ttingere
,
qtM aa
1pjir14
ob¡ec111m pertinent
,
nemp"I: t¡ttd! ad pondU1 n11memm
&
menfhram fpeélant.
f2!!;tre Ji•ppojito q11od in aq116! g11tta q11á!tbet
,
e:" cerio
&
determin11to ang11lo
JJeél11ta, certus iridis color 11ppareat
,
¡,,czte iridis, rotttnditlU, loe&,
&
jitru Cd!lerd!qt1i
propriettttes item coron11mm cti11m geome1rice
a
Mathematico demoefl111nt11r
;
q1tia t11mm
eti11m ex noftris principiis mult11m l11cis, htúc phi!ofophú p111ti 11./fimdi potejl, hanc veniam
mihi concedt vel1m, ru liceat nonnihil philofoph11m agere,
&
q11id certi, quid incmi, quid
probabilis
in
hac materia affirat philofophia invefligare. Primo q11idem hanc exiflimo
re-'
JJonfzonem rejiciendam, 11t invalidam
&
injif[(icientem, q11á tantttm in genere af{erit ex
va~
ria l11cis ,
&
opaci mixtione v11ms colores oriri
&
nihil in partiwlari explicat
,
71ec
t1IL~m
fa!tem prob11bilem rationem in medi1mi ajfert cltY Ji1b tali determinato angttlo is potirls
1
q11am alitts color Je
(e
!Jeéland11m exhibeat.
Neqree ego hic me rationem convincentem
&
cui omninopojit mens acqmefiere all11turttrn in me recipio; tentaf{e t11men jwvabit,
&
aliort1m
attt comment11, aut rationes examinaml1U proponere. Ne tamen in incermm jl11Eltiemr1s ab ex-'
perientiis certis
&
ind11bitatis exordiend11m
eJl
:
ideoqrie elU refmcm experientilH qnd! in q1d-
/ibet grttta aqttd! attt in phiala aqtea plena
a
quol1bet feri pofomt.
. .
.
P11ter Franctfc1u Maria Grima/di in opere pofthremo de /umine, colorationes l11mtl!tJ, r::•
diis dijfraElú trib11it.
//t1lt ergo qt1oties t"adires
ita 1111t coarElatter, a11t rejleélitr'.r, ut .non
rmiformiter d1Jergatrer, fed qttaji mm violenti11 in panes non tmittt-s ª.beat
,
totles
fim
~o
iorationem. f2!!_am di!Jerfionem aliter explicare non pot
1
ei,
nifi q11od f/1d1us 1.q11e
untfo~mrttf
extr.ndt
&
q11afi dilatari debteerat, pl11s ex rena parte dt!atttllr, r¡1111m ex alta. ideo
mgon~metriam adhibrei ut experiret
,
1111
¡,,
ommb1'S color11tionib11s apparentebtJS
,
id(emper evem–
ret
5
re(ponditq11e calmlru cog/tatis. Hanc igitter di/fraElionem mdii
l'lJeQ
modo e.vpltcabo,
iJ'
in ea Jitam effe colorat1onem apparentem oftendam,
D IGRESSI O