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s = 10 cm
f = 6 cm
h= 4 cm
s' = s.f / s-f
s' = 60/4
s' = 15 cm
m = s'/s = h'/h
15/10 = h'/4
60 = 10h'
h' = 6 cm
lensa cekung
s' = s.f / s-f
s' = -60/ 16
s' = -3.75 cm (- karena maya)
s'/s = h'/h
3.75/10 = h'/4
15 = 10h'
h' = 1,5
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