Jawabanmu

2014-01-03T19:57:27+07:00
Sbenda=15 cm
r=20 cm
f=10cm
1/f=1/s+1/s'
1/10=1/15+1/s'
3/30-2/30=1/s'
1/30=1/s'
s'=30cm
M=30/15=2
nyata tblk diperbesar

maaf, f nya 10, dri mna ya ?
R/2
terima kasih ya :)