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f = 12cm
M = 4 kali
Ditanya: s......?
I M = s'/s I
4 = s'/s
s' = 4s
1/s = 1/f - 1/s'
1/s = 1/12 - 1/4s
1/s + 1/4s = 1/12
4/4s + 1/4s = 1/12
5/4s = 1/12
4s = 12 x 5
s = 60/4
s = 15cm
jd jarak benda = 15cm