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diff --git a/752/CH20/EX20.2.3/20_2_3.sce b/752/CH20/EX20.2.3/20_2_3.sce
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+clc;
+//page no 763
+//prob no. 20.2.3
+d=5*10^-6;wave=1.3*10^-6;NA=0.35;
+//Determination of V no.
+V=(%pi)*d*NA/wave;
+disp(V,'the v no. is' );
+disp('from the table it is seen that 6 modes have cut off v less than 4.23 ');
+\ No newline at end of file