129 



Lentis P cum signo mutato, sive 



.^ " i. 

 'T" , o.nw 1.23664. 



x = (- 1.37069 + --) X x + o-Wfo - -> 



quo valore substitute habetw ^Equatio pro Indice x: 



+ ~*W43*\ + i-4W \ 



x* 1.7WO > X * 3 - W7 > = o. 

 t + z ' m + 2 ' 



. 

 adeoque AT = - i.ztfjg -- --- h 



r 

 unde prodeunt bini valores Indicia x, scilicet 



2 . 2^4 o . 47464 



-r, & x = - r.77i + ;---, 

 in + t m + / 



quibus datis dantur radii facierum per formnlas sequentes: 

 Radius faciei anterkri& Lentis P . .'y- : 



P P 



= - V posterioris . . . . sr - - - 

 A + k - x o 



' . r. 

 Radius faciei anterioris Lentis /*'.... 



= - - -; posterioris . . . ; = -- - - _. 



" * n - k 



K _ x -j --- 



2.fn +f) 

 j, (l ^ 



m + t 



fcarmuTae ad numeros. reduetse dant sequentia bin.a Len-- 

 iiuin paria: 



