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h (tinggi benda) = 3cm
f (titik fokus) = 15 cm
h' ( tinggi bayangan) =?
1/f = 1/s+1/s'
1/15 = 1/6 + 1/s'
1 = s' + 6
15 6s'
6s' =15 (s' + 6)
6s' = 15s' + 90
-9s' = 90
s' = -10cm
s = h
s' h'
6/10 = 3/h'
6h' = 30
h' = 5 cm
2. s=30cm f = 20 cm
1/f= 1/s +1/s'
1/20 = 1/30 + 1/s'
1 = s' + 30
20 30s'
30s' =20s' +600
10s' = 600
s' = 60 cm