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1/s' =1/f -1/s
1/s' = 1/20 - 1/30
1/s' = 3-2/60
1/s' = 1/60
s' = 60
M=s'/s
M=60/30
M=2
1/s' = 1/20 - 1/30
1/s' = 3/60 - 2/60
1/s' = 1/60
s' = 60 cm
M = | s'/so |
M = |60/30|
M = 2 x