Jawabanmu

2014-06-09T16:47:51+07:00
Jarak titik fokusnya 3,333 => 3,4
caranya gimana
M= s'/s => s' = M.s = 5.4 = 20

1/f=1/s+1/s'
1/f = 1/4 + 1/20
1/f= 5+1/20
1/f= 6/20
f= 20/6
f= 3,333 => 3,4
2014-06-09T17:06:22+07:00
M=s'/s
5=s'/4
s'=5.4=20 cm
maka 1/f=1/s'+1/s
1/f=1/20+1/4
1/f=(1+5)/20
1/f=6/20
f=20/6=3,33 cm