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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 81, page id 1677894601:0257
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81
Wrhether this Hypothels be true or FaIsC I do not here
consider. L content my selF writh the bare dilcorers,
That therars of Light are by lome cause or other alter-
hatels disposed to be ressected or retracted for many vi-
cissitudes.
DFFTNTTTON.
The returns of the disposition of any ray to be reflected
Preiu cau its Fits ot ealy rellexion, and those of
its disposition to be transmitted its Fits oF easy trans-
mittion, and the space it passes betreeen every re-
turn and the next return, the Interral oF its
FItS.
P R O P. ZTII.
The reason reby the surfaces of au thicte transparent
Bodies reflect part of ibe Fioht incident on them, and
refract the rest, is, that some rays at their incidence are
in Fits of easy reflexion, and others in Fits of easy trans-
mission.
Phis may be sathered trom the 24th Observation
Wrhere theLight reflected by thin plates oF Air and Crlals,
irtrich to thenaked Fre appeared erenlr irhite all over
theplate, did chrough a Prilm appear rared rith mans
successions oF Lisht and Darkenels made by alternate Ats
ot ealy rellexion and easy trantmission, the Prim
severins and distinguistring the rares ot irhich the
White reflected Light ras compoled, as as explained
abore.
st mm
And