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E=h∙ν
h=6,63∙10^(-34) J∙s
ν=2∙10^14 Hz
E=6,63∙10^(-34)∙2∙10^14 J
E=13,26∙10^(-20) J
E=(13,26∙10^(-20))/(1,6∙10^(-19) ) eV
E=8,3∙10^(-20+19) eV
E=8,3∙10^(-1) eV
E=0,83eV
Oblicz ogniskową soczewki o zdolności skupiającej -2D
D=1/f
f=1/D
f=1/(-2D)
f=-0,5m