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S = 20 cm
f = -15 cm
d' = .................?
Penyelesaian :
* Mencari jarak bayangan
1/S + 1/S' = 1/f
1/20 + 1/S' = -1/15
1/S' = -1/15 - 1/20
1/S' = (-4 - 3) / 60
1/S' = -7/60
S' = -60/7 cm
* Mencari diameter bayangan
I S'/S I = I d'/d I
I -60/7 / 20 I = d'/5
60/140 = d'/5
300 = 140d'
d' = 300/140
d' = 30/14
d' = 15/7 cm
Jadi, diameter bayangan adalah 15/7 cm