The experimentaly measured transmission spectra of metal, insulator and semiconductor thin films are shown in the figure. it can be inferred that 1, ii and iii

The experimentaly measured transmission spectra of metal, insulator and semiconductor thin films are shown in the figure. It can be inferred that 1, II and III correspond, respectively, to (a) insulator, semiconductor and metal (b) semiconductor, metal and insulator (c) metal, semiconductor and insulator (d) insulator, metal and semiconductor (a) 1000 300 Wavelength (nm)