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f = 20 cm
S' = .........?
Penyelesaian :
1/S + 1/S' = 1/f
1/30 + 1/S' = 1/20
1/S' = 1/20 - 1/30
1/S' = (3-2) / 60
1/S' = 1/60
S' = 60 cm
Jadi, jarak bayangan yang dihasilkan aalah 60 cm