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s = 60 cm
s' = -24 cm
ditanyakan :
f = ?
M = ?
jawab :
1/f = 1/s + 1/s'
1/f = 1/60 - 1/24
1/f = 2/120 - 5/120 = -3/120
f = -120/3 = -40 cm
M = s'/s = 24/60 = 0,4 kali