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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)
# Folio 473, page id 779785487:0531
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241
t
LFB. III. DE RE F R A CFEOWE, QEC.
nempe risio AE per lineam reCTaI;
hoc est per radiurm retractum, Ocu-
lo incidencem; IIinc demum con-
clado; cumdem angulum setsa-
ccionis comperere radio inciden-
ei ex raro in denlum obliquius,
ex denso vero in rarum, iinus
obligué.
Terrio, cum radius cadic Cx ra-
r0 in dentum, re habeatur angulus
refractionis debet derrahi angulus
retiactus; ex ansulo complemen.
Ti, anouli incidentia; COntTa ve-
ro cum cadit ex denso in rarum,
hic, ex illo decrati debet; hinc iux-
ca primum calum, angulus comple-
mencimaior est retracto, coro angu.
lo retcactionis; at iuxta lecundum,
angulus retractus maior cs angu-
lo complementi, eodem angulo se-
Fractionis.
Ouarro, altumpeo maxiimo an-
sulo retractionis; cum Cciliccera.
dius cadic ex raro, in densum, si
Pradictus angulus retractionismu-
terur in angulum incidenrix, de
Fadius cadat ex den(o in FAFUII, La -
dius retractus cum mediorum
commiltura e lectione convenier;
V. sic praedictus angulus refractio-
nis DBE, omnium maximus in da-
ta retractionum mentura, s idem
Sc anoulus incidentix, radio scili-
cet EB cadence ex denlo in rarum,
radius sefractus eric BA, VE PACCE CZ
dieris.
Oninco, Fline R allumatur alius
radius, v. 8. MB, obliguius inci-
dens ex denso, in carum, radius
retractus inera idem medium des-
Tum regredierur; rario est, quia
radio obliguius cadenri ex dento,
in rarum, minor angulus retra-
ctionis non comperie, quam mi-
nus oblique cadenti; led radio
TOm. Ido
FB comperu anguus tentactos
RBA; Igicul MB OOGMuS CaMLII
ci, non compece lallcus s l
quod camen hctet, I Lactus lCna
etus non regredererur intra idem
medium dentum; et haec est racio
muleorum experimentorum, qua
cum aliqui ad lua principia redu-
cere non polline, quali miraculi
loco habere videntur, cum camen
ex iactis lupra principiis Facile in-
telliganeur.
Sexto, Hlinc aliquando angulus.
retractionis equalis est angulo in
cidentix, sue radius ex raro, in
dentum; sinc ex dento, in LarUM
cadat; v. 9. angulus incidentia, ia-
dio cadente ex dento in rarum, est
EBD, cui angulus cetractionis
aequalis competie, Ccilicet ABR;
s vero radius ex raco, Cadat ina
dentum, cum paulo obliquiiis ca-
dic, angulus refractionis est maior
angulo incidentia, COntra vero
hic maior illo, cum minus obli-
que cadit; igirur darur aliquis an-
sulus incidencia aequalis angulo
refractionis, qui quoinodo haberi
Polir, viderine GCOmeEEX, reS enIm
Parui momenti cst.
Seprimo; detiniri porest quo-
modo hac retractio, _ in qua pro-
Portione, in co lcilicer radio inci-
dente, cui retractus compecens
cum sectione mediorum concurrit,
vique ad eadium incidentem, cum
eadem mediorum (eCtiOnE CONCUE
rentem; v. 9. a radio EB, vIquo
ad DB; sic enim radius DB obli-
quissime incidens, qui phylice lo-
quendo accipi porest re parallelus,
vel concurrens cum ipla communi.
mediorum sectione DA; hie haud
dubié perinde se habet, sinc Cx
dento in carum; Eiuc ex rato in
d