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# Title: Leibniz-Handschriften zur Optik und Dioptrik LH 37, 2
# Folio 119r, page id 00068531:0237
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et reflexionem
Ab. 56  y
Cartesius Efractionem explicat comparatione pilae
issa nunc sane refrectione, quae sic satis commode
per pitam explicari potest, modo alia tamen accedant.
Ostendam cartosium nullo modo refractionem explicuisse.
 lucis
constat radium AB inmedium deusius illapsum refringi
ad perpendicularem in BC atque ibi rursus inglessum restitui
in viam prim poratictam. CD. parallelam priori AR
modo scilicet plana refringentia sint parallela.
Hac ille eta expli
BC
E
pro radio lucis sumamus pilam, quae x in Tabula polita AD decurrens
occurrit alteri tapete instratae, ubi difficilior paulo motus fit adeoque perus
in ea per rectam CD ob maius obstaculum a perpendiculari nonnihil
declinat. Maius ergo obstaculum essse putat Eodem modo ponendo rad
aerem facilius in vitro qu ut BC quam in aere ut C progredi
ert vitrum tabulae politae aerque tabulae tapete in stratae locum habebit
adeoque radius a perpendiculari exrens ex vitro in aerem a perpendicula
declinabit. Plansibile hoc est, et plerisque  satisfecit. sed non mihi
ob cum enim variis de repractione enim tentatis Hypothesibus vidissem
non
plerasque ex eo refutari, quod in illis daretur regnessus seu connersio
constitur idem experiri in sartesiana et sane comperi non satisface
1. C0
Cit
quod ita ottendo. Verum est pilam recta BC venientem intelligi. possis
motam composita directione ex perpendiculari ad planum refririeris
in C et honcontali ad hoc planum pamlera et motr perce
A a
ee
il
aa
a parallelo salvo, n minui per resistentiam solum perprendicularem
patet inde
medio
nin refractionem a perpendiculari. Se si pita in
ficili
orante Cd pergens, tandem rursus priori nempe faciliori occurrat
tunc non recuperabit amissam directionis perpendicularis celeritatem
sola enim medii facilitat celeritatem non auget. Nonamque enim
pilam formento excussam perforare macerdem, inquea vinum
e
partem, amibtele, utique eas it ingressu in actrem non
remperabit. Quod tamen necesse e
u
s
S nam manense
semper motu horizontali, deberet intendi perpendicularis, ut frat
refractio ad perpendicularem. Quae cum ita sint certum est Cams
artesim veratus refractins causuu non redi deisse