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1/f = 1/s + 1/s'
1/0,5 = 1/2 + 1/s'
1/s' = 1/0,5 - 1/2
1/s' = 4/2 - 1/2
1/s' = 3/2
s' = 2/3 = 0,6
M= s'/s = 0,6/ 2 = 0,3 kali
h' = m x h
0,3 x 1 = 0,3 m