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2. kurang lengkap soalnya, tidak ada jarak bayangannya
2. f = 20 cm M = 4 kali
m = si/so
4 = si/so
si = 4so
1/f = 1/so + 1/si
1/20 = 1/so + 1/4so
1/20= 4/4so + 1/4so
1/20 = 5/4so
4so = 100
so = 25 cm