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s = 12cm
s'?
1/f = 1/s + 1/s'
1/s' = 1/f - 1/s
1/s' = 1/4 - 1/12
1/s' = 2/12
s' = 6cm
M = s'/s
M = 6/12
M = 0,5 kali
= 3/12 - 1/12
= 2/12
=12:2
6 cm
M': m = 6:12
=0,5 kali