Jawabanmu

2014-05-15T15:11:39+07:00
Diketahui = R = 4cm 
              = So = 60 cm
Ditanya = Si
Jawab =
f = 1/2 R
f = 1/2 x 4
f = 2

1/si = 1/f - 1/So
1/Si = 1/2 - 1/60
1/ Si = 30-1/ 60
1/Si = 29/60
29 Si = 60
Si = 60/29
Si = 2,068
1 5 1