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so = 15 cm
R = - 60 cm
ditanya =
si = ...
dijawab =
2 / R = 1 / so + 1 / si
1 / si = 2 / R - 1 / so
= - 2 / 60 - 1 / 15
= - 2 / 60 - 4 / 60
1 / si = - 6 / 60
si = 60 / - 6
si = - 10
si = 10 cm di belakang cermin (b)