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# Title: [Lectiones XVIII, Cantabrigiae in Scholis publicis habitae] Lectiones XVIII, Cantabrigiæ in Scholis publicis habitæ (shelfmarks Leibn. Marg. 0; ZEN Leibn. Marg. 0)
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 F C
Fxemp. III. Proponatur circulus specularis concavus MBH, 
radiorum OM, O N reblexi (InEM F, NO (se decussantes in L, _
cum ipsis OM, ON concurrentes punctis Z, Y) inter hos collocetur
objectum F A C; ejus iridem imago rectis OM, O N interjacebit,
pura ad e a v. comparando jam ansulos apparentes FOC, eOr
clare vides objecti F AC speciem imminui. item cernis puncta sibi
respondentia F, 8, _ C, 3 ad alias ac alias parres jacere, seu objecti
licum hinc inverri. Ouod siinera angulum de spatium X LI Y statui
concipiatur objectum, clarum est hinc ejus quidem speciem ampliari,
sed adtuc Cirum inverti. (in inter ipsa X Y consistat objectum, ejuc
itidem inrertetur litus, ac quancitas non immutabicur. demum li intra
angulum NAIM constituatur objectum, Puta RLS; cujus imago
Cirs no; eridens est hujusce speciem crescere, litumque retineri.
Exemp. IV. Proponatur circulus Specularis convexns MBH:
factisque similiter ac in eo quod immediare praecessr omnibus; né
plura prodisam rerba, vides objecti F AO speciem (Pa V) co-
arctari, sed ejusce politionem eandem perhictere.
Exemp. V: Proponatur lens aliqua (exempli gratia, lens plano
ConVexa) M B HI OP. Raclii OM, O N ad siperticiem M BN
retringantur in MP, NQ; cum ip(IMP, NO ad Superticiem P
retringantur in. iplos P F, OO (sele decustances in HI, d cum ip (I5
OM, O. N. concurrentes ad X, Y) vides jum in prima houra, si ob
jectum PA C intra X Y (versus HI) Cacuatur, iplum ab imagine
a 3 majus, quam obtutu simplice, repexesentari. Ouod Cincer ipla
Puncta Z, E subintellisatur collocatum, ejus quantitas reuciquam immu-
tabitur. at (i supra XY Cacuacur objectum R2LS, ejus species, ad pa s
conspicua, diminuetur; ubique vero punctorum correspondentium
polirio dixecta permanebit. iui1.
c
In altera vero figura (ubi retracti P F, OO versus aReM PFOCur.
renteS COnVerGUNE) cum objectum P A C citra punctum II lumitur
vides ejus speciem quantitare adauctam, at situ non muratam. verum
objecti R L. Sulera concurtum HI polici imaso sn b nedum ProtOIY PO
major est, ac quoad litum etiam eidem in vecla.
Ft hoc quidem pacto nulla non lens pro varia vel objecti vel oculi
volicione, objecti speciem aliam exhiber ac aliam; nunc dilatat, tunc
contrahie; modo rectam dat, mox inversam; Tubinde propius adducie,
nonnunquam lorisius amoret. Sinsulos casus adt examen tacile redises
hoc ad specimen aciera mentis incenderdo.
Ouinimo
Fi2. 172.
en ea
615. 172.
E18. 273.
E18