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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 61, page id 1677894601:0071
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and subducted From the Anole oF Retraction oF the mean
retranoible RayS, Which was 53 deg. 35, gires the An-
oles ot Retraction of che most and least retrangible Rays
54 de8. 5 2, and 53 deg. 4 58, Whole Sincs are 8099
and 7995, the common Angle ot Incidence beins 31 de8.
15 and its Sine 5188; arid chese sines in che least round
numbers are in proportion to one another a5 78 and 7 7
10 50.
Noir il rou subduet che common sine ot Incidence 50
trom the Sines of Retraction 77 and 78, the remainders
27 and 28 Them chac in (mall Retractions che Retraction
OF che least retransible Rays isto the Retraction of the molt
retransible ones 25 271028 very nearly, and chat the dit-
ference ofthe Retractions of che least retrangible and most
retransible Rars is about the 27th pare oF che Whole Re-
Fraccion ot che mean retranoible Rars.
WVhence cher chac are stilled in Opricks will casils un-
derstand, chac che breadch ot che. least circular space into
irtrich Obiecc. Glasses ot Telelcopes can collect all Ports ot
Parallet RayS, is abouc the 27sch part oF half che aperture
ot che ClalS, Or 55ch parc oF che whole aperture; and
chac che Focus of the most retransible Rays is nearer to the
Objecc- Class chanthe Focus ot the least retransible ones, by
abouc che 27th part ot che distance berween. the Objecr.
Class and che Focus ofthe mean retrangible ones.
And is Rays oFall Pores, Roing from any one lucid point
in che Axis of any conrex Lens, be made by the Retraction
ot che Lens EO COnVerse to poins not too remore from the
Lens, che Focus ol the most retrangible Rays BaIl bC
nearer co che L ens chan the Focus ot che least retrangible.
ones, by a distance irtich is ro che 27sch pare oF che di-
Aance ot che Focus of the mean retrangible Rays From che
Lens as che distance becireen thac Focus and the lucid
POImE