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