Assume for some applications it is necessary to grow InGaAs of high quality on InP substrate. What is the composition of this alloy? (Use Vegard's Law). What is its lattice constant? What is its bandgap and the wavelength of light that will be emitted by this alloy?

\fAlloys Eg (ev) Alx Gal-x As 1.42 + 1.247x Alx In1-X As 0.360 + 2.012x + 0.698x2 Gax In1-xAs 0.360 + 1.064x Gax In1-x Sb 0.172 + 0.139x + 0.415x2 Alx Gal-x Sb 0.726 + 1.129x + 0.368x2 Alx In1-x Sb 0.172 + 1.621x + 0.430x2