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+//Example 5.3, Page number 5.29
+
+clc;clear;close
+
+// variable declaration
+d=50                // diameter
+n1=1.450// unitless
+n2=1.447// unitless
+lamda=1             // wavelength
+
+// Calculations
+N_a=(n1**2-n2**2)   // Numerical aperture
+N=4.9*(((d*10**-6*N_a)/(lamda*10**-6))**2)// Numerical aperture
+
+// Results
+printf("Numerical aperture = %.5f",N_a)
+printf("\nNo. of modes that can be propogated = %.f",N)