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# Title: [Physica, Id Est, Scientia Rerum Corporearum, In Decem Tractatus Distributa] Physica, Id Est, Scientia Rervm Corporearvm, In Decem Tractatvs Distribvta (shelfmarks Leibn. Marg. 7:1-2; ZEN Leibn. Marg. 7:1-2)
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LIB. III. DE REFR ACYIOHE, EC.
ROP. LIV
Per refractionem, multi radis re-
dire possunt: Sine enim duo globu-
218. 45. lin A, ee B, denlracis homogenex; (Ic
F2dius luminis incidens CV, qui (I
producatur, promouerur in F; sed
quia medium detus cA, incuruaTuE
in DF Ccilicer versus perpendicu-
larem DA; deinde DF, Si produca-
cur, rendic in FI; Ced quia medium
rarius lubic, Frangicur in FI, Scilicee
a perpendiculari AFC; sic aurem
FI, Parallela plano RS; deinde FI
retringitur in IO, ica re IO, FD. Cinc
aequales; ec IO, in OH; ee hic cAt
redicus radii, qui post aliquor re-
Fractiones sequitur, ex principiis
Scilicer nececariisi e vero est quod
mulrum mirer, hoc a nemine, quod
Sciam, Fuisse obleruacum. cum eamen
adeo perlpicuum s; quis enim ne-
sec radium post aliquor retractio
nes redire.
PROP. LV
Elinc ex refractione, sequitur re-
pexio: Probacur quia ex retractio.
ne sequicur radii incidentis redi-
ens; led redicus radii, exrra idem pla-
num, in quod inciderat, es rellerio,
per det. 2. igitur ex retractione (c-
quirur refexio; quid clarius: Hlinc
cum iam habeas cerrissimum reste-
xionis principium, quod a nemine
non admirti non porest, non est
quod de alio incerto, immo nullo,
nullum enim aliud in hac luminis
hypocheli esse porest, laboremus.
LROF. LV1.
relt, cum luminis reflexionem se-
cundum angulos aequales angulis
incidentix semper heri rideamus:
itaque de re quodlc, constat, ae
Proprer quid lc in hac luminis hy-
pocheli, in qua lumen qualicas esse
Lupponitur, nunquam hactenus
vidi demonstratum; hoc tamen, ni
Fallor, ex nottris principiis, Caris
magna Facilirare demonstratur; line
enim duo slobi rierei v. 8. A, B; (IC
EI in rerumque cadens, secundum
eamdem incidenciam, quod vE AAE
SIE F L parallela AB, connectemri
centra; cerre si FY retringatur in
IO, IF retringetur in FD, cruntque
2ECuS FD, ID aequales; ac proin-
de aequalis incidentia radiorum
IO, FD, igicur cum retringatur 10.
in OTF, a FD, in DC, crunc angule
retracti MON, VDC aequales, 2c
proinde h sic planum RS, paralle-
Lum AB, erunc anguliNIS, CPR
aquales; his pohris, qua in con-
erouerliam cadere non pollunt; t
radius CD incidar in globum den-
Cum A, e retringatur in DF, cum
in FI, cum in 2O, denique in ON,
radius OI erir reAexUS, peE PCOP.
55. erirque angulus retlexionis
NTS aequalis angulo incidentix
CPR: iraque quorielcunque pla-
num reflectens est parallelum lincae
connectenti cenera, A cerriuS i2-
dius, vel cerrium Cegmencum eAt
parallelum cidem, cunc retlexio AE
secundum angulos aequales angu.
lis incidenrix, de quo intra.
PROP. LVI
ex refractione, sequitur reftexio
sebium anentos asibus menos
incidentia: Hlaec propolitio cerrissi-
 hypocheleos loco haberi po-
Desttri pous ots o sbt
SLLaLC pFOP. IA CCTTOS
numeros distingo.
om. 2
bulorum, cum secntorum, tum re-
d. d C Cancumi duo elObulI.
2R F
EFHHE