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d=y=0,25m=25cm
f=5cm
wzór;
1/f=1/x+1/y
p=y/x
rozwiazanie;
1/5cm=1/x+1/20cm
1/5cm-1/20cm=1/x
1/x=3/20
x=6,6cm
p=25cm/6,6cm=3
odp; powiększenie tego obrazu wynosi 4;)