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R = 20 cm → f = + 10 cm
m = 2 kali (nyata)
s = __?
Perbesaran
m = s' / s = 2
s' = 2s
Jarak benda
1/s + 1/s' = 1/f
1/s + 1/2s = 1/10
(2+1) / 2s = 1/10
3 / 2s = 1/10
2s = 30
s = 15 cm ← jwb