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diff --git a/3020/CH12/EX12.2/ex12_2.sce b/3020/CH12/EX12.2/ex12_2.sce
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+clc;
+clear all;
+d = 6e-6; // Diameter of fiber in meters
+lambda = 1.5e-6; // Wavelength of laser source in meters
+n1 = 1.47; // Refractive index of core
+n2 = 1.43; // Refractice index of clad
+NA = sqrt(n1^2-n2^2); // Numerical Aperture
+N = 4.9*((d*NA)/lambda)^2 // Number of modes propogating through fiber is
+disp('',N,'Number of modes propogating through fiber is')
+// Slight variation in the answer as compared to book... Checked in calculator... Book's mistake