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+//Example 5.1, Page number 5.28
+
+clc;clear;close
+
+//variable declaration
+n1=1.50          //Core refractive index
+n2=1.47          //Cladding refractive index
+
+//Calculations
+C_a=asin(n2/n1)        //Critical angle       
+N_a=(n1**2-n2**2)**(1/2) // Numerical Aperture
+A_a=asin(N_a) // degree
+
+//Results
+printf("The Critical angle = %0.1f degrees",(C_a*180/%pi))
+printf("\nThe numerical aperture = %0.2f",N_a)
+printf("\nThe acceptance angle = %0.1f degress",(A_a*180/%pi))