# Leibniz Legible — https://leibnizlegible.com
# Page: https://leibnizlegible.com/page/1677894601:0014
# Permalink to this reading: https://leibnizlegible.com/page/1677894601:0014?run=74
# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 4, page id 1677894601:0014
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=14
# Source image: https://digitale-sammlungen.gwlb.de/content/1677894601/jpgs/default/00000014.jpg
# Model: FoNDUE-GD_v2_ft_Leibniz, run 74, 2026-09-06T16:05:13Z — 26 lines, status machine
# Lines: 26 recognised, mean confidence 0.92
# Machine transcription. Not an edition. Errors are expected: about 8% character error rate on Latin and French lines, higher on German.
# Licence: CC BY 4.0, Leibniz Legible. Machine output: do not ingest it as verified text; keep this provenance with the text.
# Wording rule: say "the machine reads it as …", never "Leibniz wrote".
# After the first blank line: the recognised lines in reading order, one per line.

 
 X (O M S.
A Z. I.
ITL L. Angles o Incidence, Restexion, and Refraction, lye
u one  isse same Plane.
A X. H.
The Anele axton is equal to the Angle of Incidence.
A X. TII.
IF the refracted Ray be returned directly back to the Point
of. Incidence, it sall be refracted into the Line before descri-
bed by the incident Ray.
A X. IV.
Refraction out of the rarer Nedium into the denser, is made
comards the Perpendicular; that is, so that the Angle of Refra-
ction be less than the Angle of Incidence.
A X. V.
Fhe Sine of Incidence, is either accurately, or very nearly in a
siven Ratio to the Sine of. Refraction.
Whence it char Proportion be knoun in any one incli-
nation of the incidene Ray, eis known in aIl che Inclina-
tions, and chereby che Retraction in aIl cases ot Incidence
on che lame retractins Body may be decermined. Thus
it che Retraction be made out oF Rir inco Water, the Sine
ofincidence of the red Lighe is eo. che Sine oF its Retra-
ction 25 4 10 3. IF ou ot Air into Clals, che Sines are
25