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+//Example 5.11, Page number 5.30
+
+clc;clear;close
+
+// variable declaration
+n1=1.480 //unitless
+n2=1.465 //unitless
+V=2.405 //unitless
+lamda=850*10**-9 // in m
+
+// Calculations
+delta=(n1**2-n2**2)/(2*n1**2) //unitless
+a=(V*lamda*10**-9)/(2*%pi*n1*sqrt(2*delta)) // in m
+
+// Results
+printf("delta = %.2f",(delta))
+printf("\nCore radius,a = %.2f micro-m",(a*10**15))