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+//Fiber-optics communication technology, by Djafer K. Mynbaev and Lowell L. Scheiner 
+//Example 3.3.1
+//windows 7
+//Scilab version-6.0.0
+clc;
+clear;
+//given
+d=62.5E-6;//core diameter in SI units
+NA=0.275;//numerical aperture
+lambda=1300E-9;//operating wavelength lambda in m
+
+x=3.14*d*NA;
+
+V=x/lambda;
+
+N=(V^2)/4;
+
+mprintf("Number of modes for graded index fiber = %.0f",N);