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s = 75 cm
R = 60cm
f = R/2
= 60/2
= 30 cm
1/f = 1/s + 1/s'
1/30 = 1/75 + 1/s'
1/s' = 1/30 - 1/75
= 5/150 - 2/150
= 3/150
= 1/50
s' = 50 cm