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+//clear//
+//Caption: Finding Enegy gap and Wavelength
+//Example4.4
+//page146
+clear;
+close;
+clc;
+y =0.57;// compositional parameter of InGaAsP
+Eg = 1.35-0.72*y+0.12*(y^2);
+Lamda = 1.240/Eg;
+disp(Eg,'Band Energy gap in ev')
+disp(Lamda,'Wavelength in micro meters')
+//Result
+// Band Energy gap in ev  0.978588      
+// Wavelength in micro meters 1.2671318