( ioi8 ) 
their feveral refradions through the two GlafTes and 
the Coats and Humours of the Eye, meet upon the 
Rttlnx at /3, where they projed the diftin<3 Image of 
the Point h. The Rays that come from all the Points 
of the ObjeQ: A B being afFedled after the fame man- 
ner, give a diftindt Image of thole Points upon the 
Retina, and therefore the Objedf does appear diftin(5. 
The Objedt will alfo appear magnified in the fame 
proportion as the Angle IQI=. lo blA a ( under which 
its Image is feen J is greater than the Angle A C B un- 
der which the Objedl AB would be feen by the naked 
Eye ; as is more at large deraonflrated by Dioptrical 
Writers. 
Lemma i. 
If parallel Rays fall upon the Cornea of a My ops, or 
fhort-fighted Perfbn, they will unite in the Eye, before 
they come to the Retina, the farther from it the more 
Convex the Eye is ; but if the Rays which fall upon 
the Cornea diverge in proportion to the too great Convc«" 
xity of the Eye, as from D, fuch Rays will be fo refra- 
dled by the Coats and Humours of the Eye as to meet 
in one point upon the Retina RR, (cc Fig. z and 3 . 
Where I have in the Scheme negledfed the Refradfion 
of the Rays paflTing out of the Cryftalline 1C into the 
treous Humour V, as 1 do in the other Cafes- 
This Lemma is alfo demonftrated by Dioptrical 
Writers. 
Lemma 3 . 
If two Pencils of Rays ( in each whereof all the 
Rays are parallel to the Axis, as a C) fall upon diffe- 
rent Parts of the Cornea, at the greateft difianre from 
one another that can be allow’d for thofe Rays to en- 
ter the Pupil PP, their Axes will, after encring the. 
Aqueous 
