College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 63

An oil film ( n = 1.45) floating on water is illuminated by white light at normal incidence. The film is 2.80 × 10 2 nm thick. Find (a) the wavelength and color of the light in the visible spectrum most strongly reflected and (b) the wavelength and color of the light in the visible spectrum most strongly transmitted. Explain your reasoning.