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+//Example 9.3, Page Number 474
+//The Function fpround(dependency) is used to round a floating point number x to n decimal places
+clc;
+n1=2.286 //The Ordinary Refractive Index 
+d=6*(10**-3) //Refractive Index Change
+n2=n1-d //Difference of the Two
+
+NA=sqrt((n1**2)-(n2**2))
+
+first=1/(4*NA)
+first=fpround(first,2)
+
+second=3/(4*NA)
+second=fpround(second,2)
+
+mprintf("The Requirement for Single Mode Behaviour becomes:\n");
+mprintf("\t%0.2f <= d/lambda <= %0.2f",first,second);//d=5*Lambda for suitable thickness design
+
+//The answer provided in the textbook for the higher region is wrong