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s' = 1/5s
1/f = 1/s + 1/s'
1/6 = 1/s + 5/1 s
1/6 = 6/s
s = 6x6 = 36 cm
s' = 1/5 s = 1/5 x 36 cm = 7.2 cm
jadi letak benda 36 cm dan letak bayangan 7.2 cm