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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 82, page id 1677894601:0258
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=258
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82
And hence Light is in fies ot easy resterion and casy
transimistion, betore its incidence on transparent Bodies.
And probably it is put into such AES at its Rrst emisiOn
From luminous Bodies, and continues in them durins
aII its progress. Por these trs are of a lastins Nature,
25 Will appear by the next part oF this BoOk.
In this Proposition I suppole the transparent Bodies
tobe thick, because if the thicknels ot the Body BC
muich less than che interval et the AIS OF eat rellexion
and transmission of the rays, the Body lolethits rerectino
porver. For it che rays, irhich at their enterins into
the Body are put into fts of ealy transmistion, arrive at
the turthest surtace ot the Body betore they be out oF
those Ats they must De transmitted. And this is the
reason whr Bubbles oF Water lose their reflectinqe porver
Wrhen ther oror very thin, and why all opake B0.
dies irtien reduced into very (mall parts become trans-
Parent.
P ROP. XIV.
Those surfaces of transparent Bodies, Which if the ray
be in a fit of refraction do refract it most stronoly, if the
ray be in a fit of reflexion do reflect it most easily.
For re Bhemed abore in Prop. 8. that the cause ot
reflexion is not the impingins ot Light on the solid
imperrious parts ot Bodies, but lome other porrer by
intrich those solid parts aet on Lighe at a distance. We
Chered also in Prop. 9. that Bodies retlect and retract
Lighe by one and the lame porver rariously exercised in
various circumstances, and in ProD. L. that the mot
Aronsly retractins surtaces refeet the most Light: AII
urtrict