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f= ?
y=0,5 m
p=2
1/x+ 1/y = 1/f i p = y/x
p=y/x = 2
0,5 m / x = 2 to x = 0,25 m
1/0,25 + 1/0,5 = 1/f
2/0,5 + 1/0,5 = 1/f
3/0,5 = 1/f
f= 0,5/3 = 0,166 m