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s' = -5 cm
dit jarak benda
M = (25/f) + 1
f = 25 / (M -1 )
= 25 / ( 5 -1)
= 25/4
s = (s'.f)/(s-f)
= (-5 x 25/4) / (-5 - 25/4)
= 2,7 cm