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f= -20 cm
S = 30 cm
Ditanya:
S = -----?
jawab:
1/S' = 1/f - 1/S
= -1/20 - 1/30
= -3/60 - 2/60
= -5/60
S' = -12 cm
Jadi bayangan terbentuk 12 cm didepan lensa