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ho = 4 cm
so = 8 cm
R = 12 cm
ditanya =
si = ...
dijawab =
2 / R = 1 / so + 1 / si
1 / si = 2 / R - 1 / so
= 2 / 12 - 1 / 8
= 4 / 24 - 3 / 24
1 / si = 1 / 24
si = 24 cm (a)