... D.`dfdac! / 12. )2$ 4g74F$>+<7$,sai? A.F$,=+K$'nL85F$,$,-$," B.”$,,+:$,$)@5F$,4? )24 a5F$,=+K$'n'I7Y6$=@N4'I9$,Q2+Q#+'I@*$,D&'4){'aS‰4s4)g$S)#$, ... D.ou5v 24 . )2$ 4g74F$>+<7$,sai? A.F$,=+K$'nL85F$,$,-$," B.”$,,+:$,$)@5F$,4? )24 a5F$,=+K$'n'I7Y6$=@N4'I9$,Q2+Q#+'I@*$,D&'4){'aS‰4s4)g$S)#$, ... thấu kính hội tụ. 23 .>'D&'5j$,!=t''I@]4Q>'<U$,4UZ7-$, )24 4)9Q>'s$)!$,@N44)+67"&'D8s$)$HQ|)-+0)w-4J- <U$,4UZ7-$, )24 'I3$a<U$,4U$8YL8%...