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f = 6 cm
s = ?
jawab
1/f = 1/s + 1/s'
1/6 = 1/s + 1/15
1/6 - 1/15 = 1/s
3/30 = 1/s
1/10 = 1/s
maka s = 10
jadi jarak benda dr pusat cermin adl 10 cm