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+//Optoelectronics and Fiber Optics Communication by C.R. Sarkar and D.C. Sarkar
+//Example 3.5
+//OS = Windows 7
+//Scilab version 5.5.2
+
+clc;
+clear;
+
+//given
+a=4*10^-6;//radius in m
+n1=1.5;//core refractive index
+delta=0.03;//delta
+lamda=0.80*10^-6;//wavelength in m
+c=(2*delta)^0.5;//constant value
+n2=sqrt((n1^2)-(2*delta*n1^2));
+c5=((n1^2)-(n2^2))^1.5;
+Rcs=(3*n1^2*lamda)/(4*%pi*c5);//critical radius
+mprintf("\n Critical radius is =%.2f um",Rcs*1e6);//multiplication by 1e6 to convert unit to um//the answer vary due to rounding