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1/f=1/s+1/s'
1/6=1/10+1/s'
1/s'=1/6-1/10
1/s'=10/60-6/60
1/s'=4/60
s'=15cm
1/s' = 1/f- 1/s
=1/6 - 1/10
= 4 / 60
s' = 60 /4
= 15