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Si = 1/4 So
So dan Si ?
1/f = 10
f = 1/10 m
1/f = 1/So + 1/Si
10 = 1/So + 1/ (1/4So)
10 = (4So + 16 So) / 4
10 = 20So / 4
10 = 5So
So = 2 m = 200 cm
Si = 1/4So = 1/4 * 2 = 0,5 m = 50 cm