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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 22, page id 1677894601:0032
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=32
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cher: ic Follons by addins equal chines eo equal chines.
chac the Retractions ac R and HI caken together, are equal
co che Retractions at J and L caken togecher, and there
Fore che ero Rays beins equally retracted have che lame
Inclination eo one anocher alcer Retraction wrhich cher had
betore, chac is che Inclination oF halF a Dcoree ansiverine
eO EHe SUMS DIAMCCCF. FOr (0 great vas the Inclinacion
oF che Rars co one anocher betore Retraction. S0 then,
the lensch ot chelmage P P rould br che Rules oF Vul-
sar Opticks subrend an Angle oF halE 2 Dcorce ac the
Prism, and by consequence be equal to che breadch vn:
and cheretore che Image rontd be round. Thus ic would
bC WerC thC EVO RayS ZL TT and YK FIP and aIl che
rest irtrich Form che Image P n TV, alike Retranoible.
And cheretore secinu by Experience ic is Found chac che
Image is noc round bue aboue tire cimes longer chan
broad, che Rars irhich goins eo che upper end P ot che
Image sufter che orearest Retraction, mustbe more Retran-
eible chan thole irhich g0 co che lorver end Y, untels che
inequalier ot Retraction be casurl.
This Image or Spectrum P Piras coloured, being red
dc ies least retracted end T, and violet ac ies most retracted
end P, and vellon orcen and bler in che incermediate
Spaces. Which aorees rich che first Propolition, thac Liohes
irtrich difter in Colour do also differ in Retrangibilier.
Phe lengch ot che Image in che Foregoins Experients L
mealured Crom che Faincest and ourmost red ac one end, e0
che faincest and ouemost ble ac the other end.
Exper. 4. In che suns beam intich ras propagared in-
coche Room chrouph che hole in che Windo- PhUE, aE
che distance ot some Fece From the hole, Iheld che Prilm
in such a polture chac ies Aris miche be perpendicular eo
chac beam. Then I looted chroush che Prilm upon che
hole.