Jawabanmu

2014-06-16T08:40:09+07:00
M=25/f+1(jka berakomodasi)
12=25/f+1
f=25/12+1
f=2,0......+1
f=3,0.....

1/si=1/3-1/4
=4-3/12=1/12
1/si=1/12
si=12cm

jka tdak berakomodasi(2,0....)
1/si=1/2-1/4
=2-1/4
=1/4
si=4cm