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f = 1/2 R = 20
s = 30
1/f=1/s' + 1/s
1/20 = 1/s' + 1/30
1/20 - 1/30 = 1/s'
3/60 - 2/60 = 1/s'
1/60 = 1/s'
s'= 60 cm
60 cm ( tidak - ) berarti didepan
jawaban A
=1/2 x 40
=20 cm
1/f=1/s+1/s'
1/20=1/30+1/s'
3/60-2/60=1/s'
1/s'=1/60
s'=60 cm
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