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f = 20 cm
M = 2
ditanyakan :
s = ?
jawab :
M = s'/s
2 = s'/s
s' = 2 s
1/f = 1/s + 1/s'
1/20 = 1/s + 1/2s
1/20 = 2/2s + 1/2s = 3/2s
20 = 2s/3
60 = 2 s
s = 30 cm