GENERE EX SEX LENT. COMPOS. 403 



hc diipliciuiic couftrudio pro eius diftantin focali p 

 ita (e hnbct. 



Lcnticulac prioris 



, . ^ . . Cantcrloris rr-i-i, oaS^S^a ft 

 raduis facici < ,. ■ ■ ^ ^ 



^poltcnons — — o, 6z^i$p 



Lenticulac poftcrioris 



,. ^ . . Cuitcrioris —4-2,14041/) 



radius faciei ■< ,, • • > -r -r i' 



^poltcrioris — 4-0, ^jz^izp 



quac ad intcruallum circitcr '^p coniungi debent, tum 

 vero apcrtura tribui poterit , cuius diamctcr fit 

 = ,%p ac proindc .v - ,%p , vnde {itj-^.t.-:^ 

 ob p—a proximc et gradus claritatis — ' " 



■m n' 



13. Praetcrca hic perpcndendum cft, nume- 

 rum i ita afliimi debere , vt diamcter aperturaa 

 lcntis fecundac (^q=:7— ^ non fuperet femiflem 

 vdiUantiae focalis Jiuius lentis. Ad hoc autem re- 

 quiritur, vt fit- i^p^ mll^jf Cum igitur pofuerimus 

 i-r"ii h^^^ conditio poftulat vt fumatur «^^^rf^S 

 quod fi hic valor n — , i - , \'cl / — ma~j i m 

 noftris formulis fubllituatur , habcbimus. 



f=iri:ji^i ??—2Xi AB—Aa 



q^^i^a; Q(l—^ika; BC=;drT/Afl 



Jk.{ma^l].*mal v tfVi *^ . • C T^ — ^llHS^tll 



^ — (ma-jiXJ"'Wn>o-,-i;-j-A/(r.a-nO/' ^^ — ma-tl^t ^ ^ — ma-j l ^ 



s-'-i^"^Vi SSz::;xi DEzz^ 



Cc 2 tzz: 



