Exin quin poteris, quanto convexa patere
Debeat Irae circum fjpatio lens, nofccrc ; namque
Pupillam toties debet comprcndcrc , vitri
1455
Trans Icpta Irae quoties confpc&a augetur imago:
Atque hxc tum fiet fic lucida, claraquc prorfus,
Ipfam fi vitris fine perciperemus, ut effet.
A t fi non ca Iens fpatio, quo debet , aperta ell ,
A rd io r at paulo; poterit fat clara videri
1460
Haud minus, imbuerit rem fi lux plurima, imago.
Ardtior at multo fi fiat, pallida rerum
Effigies confit vi furum , offufaque no£lc ,
Expers nec vitio conflabit machina -tu rp i.
Incufct rerum tum forfitan infeius artem ,
14^5
Cum
188
P H I L O S O P II I
JB
fe h ab e t fe re accurate p ro p u n -
d i s o b je ffi proxim is a x i , n p ro
fo c o ocularis affiumatur n on ejus
fo cu s rad io rum parallelorum , led
fo cu s virtuaiis ra dio rum d iverg en
tiu m ab
ipfo o b jc & iv i ce n tro ,
u t facile d c m o n f t r a t u r : fed is fo
cus eft p a u llo p r o p io r ipfi o c u
lari : fi affiumantur d iftan tix fo-
calcs o b jcd livi , & ocularis , quas
dixim us effe diftantias foci a b fo lu -
ti len tium , ftvc foci radiorum
p a r a lle lo r u m ; h ab etur accurate
am plificatio a n g u li vifualis pro
pun<ftis o b je & i litis in diftantia
ab axe n o n nim is m agn a dividen
do d iftan tiam focalcm o b je tiiv i
per d iftan tiam focalcm ocularis.
Si prim a fit vicccu p lo m ajo r, quam
fecunda 5 v icccu p lo m ajor redde
tur a telcfcop io angulus vifualis
c o , qui h a b e re tu r o cu lo collo
ca to in ip fo o b je d iv i l o c o .
Jam v ero cuin radios ad fc delatos,
& jam divergentes a centro o b je ffi-
vi lens co n cava reddat adhuc m agis
divergen tes in torquen d o cos m agis
in eandem p la g a m dexteros verfus
d ex teram , finiuros verfus finiftram
fine n ova decuffiationc , non in ve r
tet in ocu lo im agin em , fed m ajo
rem p in get in eadem d ire fiio n e , in
q u a p in ge re tu r ocu lo n udo .
Notabimus hic illud etiam tan
tu m m o d o , e am am plificationis
le gem haberi p ro o cu lo bene co n -
ftitu to
n am
idem tcle fco p ium
p ro m yo p e a dm o ven te o cu la rem
o b j e & i v o , vel presbita e am re
m o v e n te , m u t a t u r .
A m p lificatio c o n n e & itu r cum
claritate , ad q u am hic facit gra -
dnm . U b i im a g o a m p lific a t u r ,
debet fieri co m inus clara , q u o
m agis eft audra , nifi ran to m a
jor copia radio rum profc<ftorum
ab unico punClo objedti d even iat
ad ocu lum , ut fin g u lx p a rtic u lx
fundi o c u lit im pellantur a q u an
titate luminis proven ien tis a q u o
vis o b jc fti pum fto ecquali ei , qua
im p e lle re n tu r, fi tclefcop ium n on
a d d ic t . Ad h aben dam eam cla
ricatis aequalitatem o p o r t e r e t , uc
diam eter apertura: v i m o b je riiv i
effiet m ajo r d iam etro p u p illi in
eadem r a t io n e , q u x exp rim it a m
plificationem : co enim p a & o to
tum lumen pertinens ad quodvis
u n icum o b je & i p u n ffu m tran fm if-
fum per totam o b je d iv i a p e rtu
ram ,
Sc
ab eo colle<ftum i t a , u t
ab oculari redigatur ad ten uem
fafciculum
qui totus p u pillam
in gre d i poffit , erit in eadem ra
tione majus lum ine ad idem p u n -
d u m pertin en te , q uod per pu
pillam tranfiiffct fine telcfcop io,
