02.43: A light ray is9n/(8t;4r8ouzz bn 2oe hyt po incident normal to a thin layer of glass. Given the figure, what is the minimum thick(uo8przb8enn h; t o/4y2ot9zness of the glass that gives the reflected light an orangish color ( $\lambda_{air}$= 600 nm) ?

  05.43: Light is incident normal to a thin layer of soap. Given the figure,vys6m twdfns kx;v8k3 8:rv05ga p 8)q what is the minimum thickness of the soap film that gives the soap a bluish color (8gvqk:xdv0p5f3y8kw;t) v 6 sarnsm8$\lambda$ = 500 nm)?

  15.38: A thin film of so)1pqips6u fzq6n7 t 4z0l1 fclq (k3oyr;3w alcohol ($n_{alcohol}$= 1.35) lies on a flat glass surface ($n_{alcohol}$ = 1.60). When light of wavelength 540 nm is incident normal to the alcohol surface from air, the light is strongly reflected, but when light of wavelength 432 nm is incident normal to the surface from air, the reflected light is minimized. Which one of the following choices could represent the thickness t of the alcohol film?