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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 51, page id 1677894601:0227
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=227
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5
But the truth oF this Propostion ill Further appear
br observins, that in the superticies interceding trro
transparent mediums, such asare (Air, Water, Oyl, Com
ion-Gla(S, Crystal. MetallineClasses, IMand-Cilases,
irhute transparent Artnick, Diamonds, dc.) the re-
fexion is Aronger or meaker accordinslr, a5 the luper-
ticies hath a greater or lels retractins porrer. Lor in
the contine oF Air and Sal-gemm tis ltronger than in
thecontine of Air and Water, and Ciil stronser in the
contine oF Air and C ommon-CEla(SOF C PV StaL, and ArOnpeF
in the contine ot Air and a Diamond. IF anY ot thele, and
Tuch like transparent Solids, be immerged in Water, its
reflexion becomes much weaker than betore, and AilI
reakcer it ther be immereed in the more Aronglr re
Fractins Liquors oF ell. rectitied oyl ot Vitriol or Ipirie
ot Turpentine. TFWater be distinguisted into trro parts,
by ans imaginaer Curtace, the retexion in the contine
Ot thole tmo pares is none at aII. In the confine oF Wa-
ter and Ice tis verr litele, in thac of Water and Oyt tis
Tomethins grenter, in that of Water and Sal-gemm Aill
Sreater, and in that of Water and CtaIS, Or C Ersal, Or
ottrer denser substances Aill greater, accordinsly as thole
mediums disfer more or lels in their retractins pOIerS.
Flence in the contine ot Common-Citass and Crysal,
there ought tobe a reak rellexion, and a Aronser re
Aexion in the contine ot Common and Metallinc- Glals,
thoueh Phave not vet eried this. But, in the contine ot
tiro Cilasses oFequat densier, there is not any sensible re-
Aexion, a5 ras hewn in the frst Obserration. And
che lame may be understood ot the luperticies interce
dins tro Crystals, or trro Liquors, or any other Sub
stances in irtrich no retraction is cauled. S0 then the
AH 2
realon