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1/s + 1/s' = 1/f
1/4 + 1/s' = -1/8
1/s' = -1/8 - 1/4
1/s' = -1/8 - 2/8
1/s' = -3/8
-3s' = 8
s' = 8:(-3)
s' = -8/3 cm = -2 2/3 cm
= 1/8 - 1/4
= -1/8
s¹ = -8
jarak bayangan 8cm dibelakang cermin