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zad.6
Z = -5 D =-5 m
Z = 1/f
f = 1/ Z
f = 1 / -5 m
f = - 0,2 m = -20 cm
odp.a
zad.10
f = 50cm = 0,5 m ( ogniskowa = odl. ogniska od soczewki )
Z = 1/f
Z= 1/0,5 m
Z = 2 D