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y= x
y=20cm
2.
=40cm
=20cm
P= :
P=2
y=50cm
P=y:x ⇒ x=y:P
x=25cm
3.
c=300000
=1,3647
=1
c:=⇒=c:
=219,828
4.
Z-zdolność skupiająca
f-ogniskowa = 20cm
Z=
Z= = = 5D
5. W załączniku