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1/So + 1/Si harus sama dengan 1/f
1/20 + 1/12 harus sama dengan 1/6
3/60 + 5/60 = 8/60 = 2/15 ≠ 1/6
2.
1/So + 1/Si = 1/f
1/20 + 1/Si = 1/12
1/Si = 1/12 - 1/20
1/Si = 5/60 - 3/60 = 2/60
Si= 60/2 = 30 cm (jarak bayangan)