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+//Optoelectronics - An Introduction, 2nd Edition by J. Wilson and J.F.B. Hawkes
+//Example 5.4
+//OS=Windows XP sp3
+//Scilab version 5.5.2
+clc;
+clear;
+
+//given
+n1=1;//Refractive index of air medium
+n2=3.6;//Refractive index of GaAs medium
+
+R=((n2-n1)/(n2+n1))^2;//Reflectance at GaAs/air interface by Fresnel equation
+mprintf("\n R = %.2f",R);