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diff --git a/752/CH20/EX20.2.1/20_2_1.sce b/752/CH20/EX20.2.1/20_2_1.sce
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+clc;
+// page no 753
+// prob no 20.2.1
+// An optic fiber is made of glass with following details
+n1=1.55;//RI of glass
+n2=1.51;//RI of clad
+// NA of the fibe is given as
+NA=n1*sqrt(2*(n1-n2)/n1);
+disp(NA,'The numerical aperture is');
+// Acceptance angle is given as
+acc_angle=asind(NA);
+disp(acc_angle,'The acceptance angle is');
+\ No newline at end of file