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s = 15 cm
f = 10 cm
ditanya =
M = ...
dijawab =
1 / f = 1 / s + 1 / s'
1 / s' = 1 / f - 1 / s
= 1 / 10 - 1 / 15
= 3 / 30 - 2 / 30
1 / s' = 1 / 30
s' = 30 cm
M = s' / s
= 30 cm / 15 cm
= 2 kali