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+//Example 8.8, Page Number 387
+//Single Mode Fiber in graded index fibers
+clc;
+
+n1=1.48//refractive index
+n2=1.46//refractive index 
+NA=0.242//numerical aperture
+l=1.5*(10**-6) //Wavelength of radiation in meters
+
+//From equation 8.27
+a=(2.405*l)/(2*%pi*NA) // a is the maximum core radius in meters
+
+disp(a,"The Maximum Core Radius is less than(in meters)")
+
+//With NA=0.1
+NA=0.1
+a=(2.405*l)/(2*%pi*NA) //a is the maximum core radius in meters
+
+disp(a," The Maximum Core radius increase in m:")
+mprintf(" With a design criterion of V=2 the core diameter would then be 9.5 um")