(a) Use a computer to plot n and k as a function of w for a dielectric (i.e. obtain graphs such as the ones in Fig. 2.5). Use the Lorentz model and the following parameters: Wo = 10wp, and y = Wp; plot your func- tion from w = O to w = 20wp. No need to choose a value for Wp; your horizontal axis will be in units of Wp. (b) Plot n and k as a function of frequency for a material that has three resonant frequencies: Wo1 = 10wp, Y1 = Wp, fi = 0.5; Wo2 = 15wp, 72 = Wp, f2 = 0.25; and wo3 = 25Wp, Y3 = 36p, f3 = 0.25. Plot the results from w = 0 to w = 30wp