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s = 20 cm
f = 10 cm
ditanya =
s' = ...
dijawab =
1 / f = 1 / s + 1 / s'
1 / s' = 1 / f - 1 / s
= 1 / 10 - 1 / 20
= 2 / 20 - 1 / 20
1 / s' = 1 / 20
s' = 20 cm (c)