No = 1 N1 = 1 N1 = 1 N1 = 1.5 N2 = 2 N2 = 2.5 N, = 2 N3 = 3 N3 = 3 N3 = 3 Figure 1: Figure needed for question 2. 3. At a wavelegth of A = 600 nm, aluminum has a refractive index of Nal = 1.20 + 27.3. (a) Does aluminum absorb light of wavelength 600 nm? Briefly justify your answer. [1 pt] (b) What are the reflectivities Rs and Ro for an incident angle of 0 and of 50? You can use your plotting script from HW 5 to work this out. [3 pt] (c) Aluminium is used as a back-contact to Silicium solar cells. Do these contacts reflect light as well as in air at the incident angles of 0 and of 50? The refractive index of Silicium at 1 = 600 nm is Nsi = 3.9 + 20.02. Show how your worked this out. [2 pt]