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+clc;clear;
+//Example 24.4
+//calculation of normailsed frequency and no of modes
+
+//given values
+n=1.52;//core refractive index
+d=29*10^-6;//core diametre in m
+l=1.3*10^-6;//wavelength of light
+x=.0007;//fractional refractive index
+
+//calculation
+u=n*(1-x);//index of glass fibre
+V=%pi*d*sqrt(n^2-u^2)/l;
+disp(V,'normalised frequency is');
+N=V^2/2;
+disp(N,'no of modes is');
+\ No newline at end of file