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1/f = 1/s + 1/s'
1/10 = 1/5 + 1/s'
1/10 - 1/5 = 1/s'
1-2/10 = 1/s'
-1/10 = 1/s'
jadi, s' = -10
M = Is'/sI
M = I-10/5I
M = I-2I
M = 2
maka perbesarannya 2 kali diperbesar