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r = 30 cm
f = 30/2 = 15
s = 10 cm
dit :
s'=.....
1/f = 1/s + 1/s'
1/15= 1/10 + 1/s'
1/s' = 1/10 - 1/15
1/s' = 3/30 - 2/30
1/s' = 1/30
jadi.....
s' = -30 cm ( hasilnya min karena cer. cemb )
Ok gan.........