Jawabanmu

2014-04-20T22:23:02+07:00
1/f = 1/s + 1/sAksen . 1/f = 1/12 + 1/60 1/f = 6/60 f=60/6 f= 10
2014-04-21T01:48:16+07:00
S = 12cm
s` = 60cm
f?
1/f = 1/s + 1/s`
  1/f =1/12 + 1/60
1/f=5/60+1/60
1/f  =6/60
f=10cm