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+clc;
+//page no 762
+//prob no. 20.2.4
+//refer example 20.2.3
+a=2;//gradding profile index
+V=69.1;//normalized cutoff freq.
+N=2390;//number of modes supported as a step index fiber 
+//Determination of no. of modes supported by graded index fiber
+N_a=(N*a)/(a+2);
+disp(N_a,'no. of modes supported by graded index fiber');
+\ No newline at end of file