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so = jarak benda
si = jarak bayangan
jadi,
1/f=1/so + 1/si
1/20=1/30+1/si
1/20-1/30=1/si
3/60-2/60=1/si
1/60=1/si
60 = si
jadi jarak bayangannya 60 cm
semoga membantu :)