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f = 8 cm
si = 16 cm
ditanya =
so = ...
dijawab =
1 / f = 1 / so + 1 / si
1 / so = 1 / f - 1 / si
= 1 / 8 - 1 / 16
= 2 / 16 - 1 / 16
1 / so = 1 / 16
so = 16 cm