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so = 10 cm
R = - 40 cm
ditanya =
si = ...
dijawab =
2 / R = 1 / so + 1 / si
1 / si = 2 / R - 1 / so
= - 2 / 40 - 1 / 10
= - 2 / 40 - 4 / 40
1 / si = - 6 / 40
si = 40 / - 6
si = 6,666... cm