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1/Si=1/F-1/So
1/Si=1/180-1/60
1/Si=3/60-1/60
1/Si=2/60
Si/1=60/2
Si=30
Jarak bayangan adalah 30
maaf klo slah
F So Si
1 = 1 + 1
180 60 Si
1 = 1 - 1
Si 60 180
1 = 3 - 1
Si 180 180
1 = 2
Si 180
Si = 90