... 0(N) lo= 12 cml' =12 cm= ..0.5......N l1=14.5 cml1'= 12 ..0.5N.....Nl1=14.5 l1'= 12 cm l1-lo=14.5 -12 ...1N...Nl2= 25cm l2'= 12 ....1N...Nl2=19,5cml2'=12cm l2-lo=19.5 -12 ...1,5....Nl3=17cm ... l2-lo=19.5 -12 ...1,5....Nl3=17cm ..1.5N...Nl3= 25.5 l3'= 12 l3-lo=25.5 -12 0(N) lo=10. cml'= 12 cm 0(N) lo=10.5 cml'=10 cm .......N l1= 12 cml1'= cm5l1-l0= ...........N l1'= 11.5...