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+// Example 5.1:w and wp
+clc;
+clear;
+close;
+format('v',7)
+n=1.46;//core refractive index
+d=0.003;//differnce in core-cladding refrative index
+a=4;//core radius in micro meter
+h1=1.30;// inmicro meter
+h2=1.55;//in micro meter
+v1=((2*%pi*(a*10^-6))*n*sqrt(2*(d)))/(h1*10^-6);//normalised frequency parameter
+v2=((2*%pi*(a*10^-6))*n*sqrt(2*(d)))/(h2*10^-6);//normalised frequency parameter
+w1=(a*10^-6)*(0.65+((1.619)/(v1)^(3/2))+(2.879/(v1)^6));//in meter
+wp1=w1-(a*10^-6)*(0.016+((1.567)/(v1)^7));//in micro meter
+w2=(a*10^-6)*(0.65+((1.619)/(v2)^(3/2))+(2.879/(v2)^6));//in meter
+wp2=w2-(a*10^-6)*(0.016+((1.567)/(v2)^7));//in micro meter
+disp(" w is "+string(w1*10^6)+" and wp is "+string(wp1*10^6)+" in micro meter when wavelength is 1.30 micro meter")
+disp(" w is "+string(w2*10^6)+" and wp is "+string(wp2*10^6)+" in micro meter when wavelength is 1.55 micro meter")