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f=1/2 x 12
f=6
1/f=1/s + 1/$
1/6=1/18+1/$
1/$=1/18-1/6
1/$=1/18-3/18
1/$=-2/18
$=18/2=9
M=s/$
M=6/9
M=2/3
sifat bayangan=maya,tegak,lebih besar