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h = 0,5 m
= 50 cm
s = 2 cm
R = - 4 cm
ditanya =
s' = ...
dijawab =
2 / R = 1 / s + 1 / s'
1 / s' = 2 / R - 1 / s
= - 2 / 4 - 1 / 2
= - 2 / 4 - 2 / 4
1 / s' = - 4 / 4
s' = 4 / - 4
s' = - 1 cm (1 cm di belakang cermin)