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h = 0,12 m = 12 cm
s = 60 cm
f = 40 cm
Jawab :
# 1/f = 1/s + 1/s'
1/40 = 1/60 + 1/s'
1/40 - 1/60 = 1/s'
3/120 - 2/120 = 1/s'
1/120 = 1/s'
120 = s'
# h'/h = s'/s
h'/12 = 120/60
h'/12 = 2/1
h' = 24 cm