tSS de lege refractionis 

 Scholion 2. 



40. Cum «. fit fracflio admodum parun ^^ , 

 fbrmulac inucntac commode pcr approximationem 

 cxhibcri poterunt ; cum cnim fit : 



t/ / a[mm — iK airnm — i) aa(mm — 1)' 



at 7:^rra — aa etc. crit Hitis accurate 



refractio rubra —m— — ;^ — -{- t^ 



r r^- ■ , , «(mm — il , aa(mm — 0'jmni-f.,) 



refradio violacea i:;;/4--^;„ — ' ■ 



ideoque diffcrentia inter Iins extremas zz.—— — - . 

 Quare fi media rcucra in illarum mcdio confifkre 



alfumatur ct Joco m H ^„ij- riiiiplici- 



ter fcribatur m, ncgledis ipfius a potctlatibus qua- 

 drato altioribus, crit 



rcfradio rubra — ;;/— /^. ""^~' 



refradlio violacea — w + j'? 



m VI . 



95' m 



Hypothefis 5. 



41. Ad fimilitudincm praeccdentis hyporliefis, 

 dum radiorum cx aerc m mcdium quodcunquc rc- 

 fradlio mcdia ert —m:i gencralius Itatuatur 



rcfradio rubra zz. ( — i^ : i ct 



I -T-a 



r r.- • , "'^— °^ i 



rcfradio violacca — ( ', : i 



X — a' 



Tt 



