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cermin CEKUNG
s = 60 cm [di ruang 1]
f = 180 cm
s' = __ ? [di ruang 4, maya]
1/s + 1/s' = 1/f
1/60 + 1/s' = 1/180
1/s' = 1/180 - 1/60
1/s' = 1/180 - 3/180
1/s' = - 2/180
s' = - 180/2 = - 90 cm ← jwb