initial commit / add all books

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diff --git a/2243/CH15/EX15.4/Ex15_4.sce b/2243/CH15/EX15.4/Ex15_4.sce
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+clc();

+clear;

+//Given :

+n1 = 1.525; // refractive index of core

+n2 = 1.500; // refractive index of cladding

+d = 30; // core diameter in mu_m

+a = d/2; // core radius in mu_m

+ab = 0.00001/100; // percentage absorbed

+delta = (n1-n2)/n1;

+Ls = a*sqrt(2/delta);// skip distance in mu_m

+//1 mu_m = 1.0*10^-6 m

+R = 1000/(Ls*10^-6); // reflections per km (1000 m)

+red_p = 1 - ab; // reduced power for each reflection

+//Power P1km = P0*red_p^(6*10^6)

+// A = 10*log10[P0/P1km] , P0 in the numerator and denominator will cancel each other

+A = 10*log10(1/(red_p)^(R));

+printf("Attenuation = %.1f dB/km",A);