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f = 8
dit s' ?
1/s' = 1/f - 1/s
= 1/8 - 1/4
= 1/8 - 2/8
= -1/8
s' = -0.125
1/8 = 1/4 + 1/s'
1/8 - 1/4 = 1/s'
1/8 - 2/8 = 1/s'
-1/8 = 1/s'
-8 = s'
jarak bayangan terhadap benda adalah 12 cm