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= 10
1/f = 1/So + 1/Si
1/ 10 = 1/So + 1/30
1/ So = 1/10 - 1/30
1/ So = 3/30 - 1/30
1/ So = 2/30
So = 15 cm
R= 20 cm
f= 10
ditanya =so
jawb = 1/so =1/f-1/si
1/so= 1/10- 1/30
1/so= 3-1/30
so = 30÷2
so=15