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s = 10 cm
f = - 15 cm
ditanya =
s' = ...
dijawab =
1 / f = 1 / s + 1 / s'
1 / s' = 1 / f - 1 / s
= - 1 / 15 - 1 / 10
= - 2 / 30 - 3 / 30
1 / s' = - 5 / 30
s' = 30 / - 5
s' = - 6 cm (di belakang cermin)