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s = 24 cm
f = 6 cm
ditanya =
M = ...
dijawab =
1 / f = 1 / s + 1 / s'
1 / s' = 1 / f - 1 / s
= 1 / 6 - 1 / 24
= 4 / 24 - 1 / 24
1 / s' = 3 / 24
s' = 24 / 3
s' = 8 cm
M = - s' / s
= - 8 cm / 24 cm
= - 8/24
= - 0,333... kali (1/3 kali) secara terbalik