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+//Fiber-optics communication technology, by Djafer K. Mynbaev and Lowell L. Scheiner 
+//Example 2.2.2
+//OS=Windows 10
+//Scilab version Scilab 6.0.0-beta-2(64 bit)
+clc;
+clear;
+
+//given
+n1=1;//refractive index 1
+theta1=30;//angle of incidence in degrees
+n2=1.5;//refractive index 2
+
+u=sind(theta1);
+theta2=asind(u/n2);//angle of refraction in degrees case1
+
+theta3=theta1//From figure 2.4(a) given theta3= theta1=30 degrees//angle of relection
+v=n2*sind(theta1);
+theta4=asind(v/n1)//angle of refraction in degrees case 2
+mprintf("\n Angle of reflection=%.1f degrees",theta3);
+mprintf("\n Angle of refraction case 1=%.1f degrees ",theta2);
+mprintf("\n Angle of refraction case2=%.1f degrees ",theta4);