Jawabanmu

2014-06-01T21:50:36+07:00
Si*f per Si+f
Si= jarak benda
f=jarak fokus
2014-06-01T21:51:06+07:00
 \frac{1}{s} +  \frac{1}{s'} =  \frac{1}{f}
s = jarak benda
s' = jarak bayangan
f = fokus