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diff --git a/2414/CH20/EX20.2/Ex20_2.sce b/2414/CH20/EX20.2/Ex20_2.sce
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+clc;
+close();
+clear();
+//page no 619
+//prob no. 20.2
+theta_i=30;    //degree
+ni=1.00;       //incident refraction index
+nr=1.52;       //refeacted ray refraction index
+theta_r=asin(ni/nr*sin(theta_i*%pi/180));    //in radians
+mprintf('angle of refraction is %.2f  degree',theta_r*180/%pi);