Jawabanmu

2014-04-11T22:36:47+07:00
R = 1/2 f jadi f = 4cm1/f = 1/s+1/s'1/4= 1/s+1/121/s=1/4-1/121/s=2/12s=6cmjadi m= s'/s         = 12/6cm = 2 kali perbesarannya 
2014-04-12T04:44:54+07:00
1/f=1/s+1/s'
1/s=1/f-1/s'
1/s=1/4-1/12=3/12-1/12=2/12=12/2=6cm
M=s'/s=12cm/6cm=2cm
jadi perbesaran bayangan adalah = 6cm