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diff --git a/374/CH2/EX2.3/23.sci b/374/CH2/EX2.3/23.sci
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+//chapter2.example.3//
+clc
+clear
+//core refractive indices of stepindex fibre=n1,cladding refractive indices of stepindex fibre=n2,wavelength=l,phase constant=b,maximum value of phase constant=b1,minimum value of phase constant=b2;//
+n1=1.6;
+n2=1.44;
+l=0.8*(10^-3);
+b1=(2*%pi*n1)/(l*(10^3));//in rad/mm//
+b2=(2*%pi*n2)/(l*(10^3));//in rad/mm//
+printf("\nmaximum value of phase constant=%f rad/mm\n",b1);
+printf("\nminimum value of phase constant=%f rad/mm\n",b2);
+\ No newline at end of file