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diff --git a/1739/CH1/EX1.4/Exa1_4.sce b/1739/CH1/EX1.4/Exa1_4.sce
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+//Exa 1.4
+clc;
+clear;
+close;
+//Given data :
+format('v',9);
+n=1.33;//refractive index
+//Formula : velocity_of_light_in_medium=velocity_of_light_in_free_space/Refractive_Index;
+c=3*10^8;//in m/s
+v=c/n;//in m/s
+disp(v,"velocity of light in medium in m/s : ");
+\ No newline at end of file