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+//Introduction to Fiber Optics by A. Ghatak and K. Thyagarajan, Cambridge, New Delhi, 1999

+//Example 11.6

+//OS=Windows XP sp3

+//Scilab version 5.5.2

+clc;

+clear;

+//given Case(i)

+lambdag=1.30e-6;//emission wavelength in m

+//Bandgap energy in eV is given by : 

+Eg=1.24/(lambdag/1e-6);//Division by 10^(-6) to convert lambdag into um

+mprintf("\nCase 1: for lambda0 =1.30 um");

+mprintf("\n Eg=%f eV",Eg);//The answers vary due to round off error

+p=[0.12 -0.72 1.35-Eg];//Relation between Eg & y is given as 'Eg(y)=1.35-0.72y+0.12y^2 in eV'

+y=roots(p);

+mprintf("\n y=%f",y(2,1));//Roots are arranged in descending order & y cannot be greater than 1

+//The answers vary due to round off error

+//given Case(ii)

+lambdag=1.55e-6;//emission wavelength in m

+//Bandgap energy in eV is given by : 

+Eg=1.24/(lambdag/1e-6);//Division by 10^(-6) to convert lambdag into um

+mprintf("\nCase 2: for lambda0 =1.55 um");

+mprintf("\n Eg=%f eV",Eg);//The answers vary due to round off error

+p=[0.12 -0.72 1.35-Eg];//Relation between Eg & y is given as 'Eg(y)=1.35-0.72y+0.12y^2 in eV'

+y=roots(p);

+mprintf("\n y=%f",y(2,1));//Roots are arranged in descending order & y cannot be greater than 1

+//The answers vary due to round off error