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dane;
X=5 cm
x=2m=200cm
Y=20cm
szukane;
f=?
y=?
wzór;
1/f=1/x+1/y
p=y/x=Y/X
rozwiązanie;
p=20cm/5cm=4
4=y/200cm
y=800cm
1/f=1/200cm+1/800cm
1/f=5/800cm
f=160cm
odp; ogniskowa tej soczewki wynosi 160 cm;)