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R=30cm
s'=?
f = 1/2 R
f= 15 cm
1/f = 1/s + 1/s'
1/15 = 1/60 + 1/s'
1/s' = 1/15 - 1/60
1/s' = 4/60 - 1/60 = 3/60
s'=60/3 = 20 cm