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400nm=400×10⁻⁹m=4×10⁻⁷m
10⁻³m:4×10⁻⁷m=0,25×10⁴=2500 razy
1nm=10⁻⁹m=10⁻⁶mm zatem
1mm/(400nm)=1mm/4*10²*10⁻⁶mm=1mm/4*10⁻⁴mm=0.25*10⁴=2500razy