02.43: A light ray is incident normal to a thin layer of glass. Given the 7*adf tk/c r,-fk3r uat s*5zdfigure, what is the minit at5 as-dk*ck*ur/dzr,ff73mum thickness of the glass that gives the reflected light an orangish color ( $\lambda_{air}$= 600 nm) ?

  05.43: Light is inciden, j6t9lsd)foc) +obo ut normal to a thin layer of soap. Given the figure, what is the minimum thickness of the soap film that gives the soap a s dc)ou )b jt9o,fl+6obluish color ($\lambda$ = 500 nm)?

  15.38: A thin film of alc4tbn3pmx ;r-e. jz+mlohol ($n_{alcohol}$= 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?