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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 99, page id 1677894601:0275
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=275
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(99
These Peem tO bC THC ReAIONS OF these RingS in gC
neral, and this put me upon obserrine the thicknels oF
the Glass, and considerins wrhether the dimentions and
proportions ot the Rines may be truly derived From il
by computation.
OBS. VIIB
I mealured theretore the thicknels oF this concaro-
conrex plate oF Gla(s, and found it every- Wwhere i oF an
Inch precisetr. Noi, by the bch Obserration oF the
first Part OC this BOOK, a thin plate OF Air tran(mitS the
briohtest LisHEOF the ArA Rine, chat is the brighe vel.
lo, Wrhen its chickness is the epo tM Paxt OF an TnCH,
and by the roth Obserration ot the lame part, a thin
plate oFClalo transmits the lame Lighe oF the same Rins
iohen its thickness is less in proportion oF the sine ot
retraction to the sine of incidence, that is, When its
chicknels iS che tM OF in tM Part OF an LncH, suP-
Potins the sines are aS TY tO F7. And if this chicknels
De doubled it transmits the lame bright LighE oF the
Second Ring, it cripled it transinies that ot the chird,
and (0 on, the briohe vellon Light in all thele cales be-
ino in itS ftS oFtransmission. And theretore if its thick-
ness be multiplied 34386 times (0 as tobecome: oF an
Inch ic transmits che lame brighe LioHt oFthe 34386FH
Ring. Suppose this be the bright vellon Lighe trans-
mitted perpendicularty from the reflectins conrex sde
OF the Gilais through the concare side tothe Wrhite Spot
in the center oF the RingS OFColOurS On theChaRE: And
by a rule inthe seventh Obserration in the ArH PaPF OF
he srA BOOK, and by the 25th and 20th PropOsitiOnS
0