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f = 12 cm
s = 18 cm
ditanya =
s' = ...
dijawab =
1 / f = 1 / s + 1 / s'
1 / s' = 1 / f - 1 / s
= 1 / 12 - 1 / 18
= 3 / 36 - 2 / 36
1 / s' = 1 / 36
s' = 36 cm