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s = 20 cm
f = - 8 cm
h = 2 cm
ditanya =
sifat bayangan = ...
dijawab =
1 / f = 1 / s + 1 / s'
1 / s' = 1 / f - 1 / s
1 / s' = - 1 / 8 - 1 / 12
1 / s' = - 3 / 24 - 2 / 24
1 / s' = - 5 / 24
s' = 24 / - 5
s' = - 4,8 cm
M = - s' / s
= - (- 4,8 cm) / 20 cm
= 4,8 / 20
= 0,24 kali
sifat bayangan = maya , tegak , diperkecil