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jarak bayangan = s' = 60 cm
fokus= f = ?
1/f = 1/s + 1/s'
1/f = 1/12 + 1/60
1/f = 5/60 + 1/60 (samakan penyebut)
1/f = 6/60
f = 60 : 6
f = 10 cm