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f = 2 cm
so = 3 cm
Dit : si
Jawab :
1/si = 1/f - 1/so
1/si = 1/2 - 1/3
1/si = 3/6 - 2/6
1/si = 1/6
si = 6 cm
s' = 3 2 / (3 - 2)
s' = 6/1
s' = 6 cm
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