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wzór na ogniskowa
30 cm = 0,3 m
1/f = 1/x + 1/y
1/f = 1/0,3m + 1/1,2m
1/f = 10/3m + 5/6m
1/f = 20/6m + 5/6m
1/f = 25/6m
f = 6/25 m
f = 0,24m
Ogniskowa wynosi 0,24 m = 24 cm