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dan s` = 12
liat gambar
S' = 12 cm
Dit : S =....?
M=....?
Jawab : 1/f = 1/S + 1/S'
1/S = 1/f - 1/S'
1/S = 1/4 - 1/12
1/S = 2/12
S = 12/2 = 6
M = S'/S= 12/6= 2
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