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clear;
close;
clc;
n1=-24.205 + i*1.52;
n2= 1;
h =5*10^-9;
lamada = 800*10^-9;
k0 = 2*pi/lamada;
syms x
k1=sqrt(x^2-n1*k0^2);
k2=sqrt(x^2-n2*k0^2);
f=exp(-2*k1*h)-(k1/n1+k2/n2)/(k1/n1-k2/n2);
solve('f=0','x')
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