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+//Example 5.12, Page number 5.31
+
+clc;clear;close
+
+// variable declaration
+n1=1.5 //unitless
+n2=1.49//unitless
+a=25 // in m
+
+// Calculations
+C_a=asin(n2/n1)           // Critical angle
+L=2*a*tan(C_a)      // in m       
+N_r=10**6/L         // reflections/m           
+
+// Result
+printf("Critical angle = %.2f degrees",(C_a*180/%pi))
+printf("\nFiber length covered in one reflection = %.2f micro-m",(L))
+printf("\nTotal no.of reflections per meter = %.f",(N_r))
+printf("\nSince L=1m, Total dist. travelled by light over one metre of fiber = %.4f m",(1/sin(C_a)))