3. Alight wave with a wavelength of 540 nm is normally incident (i.e., hits at 90) on a thin layer of oil (n = 1.46) on water (1.33). a) What is the wavelength of the light wave as it travels through the oil (3 points)? Ay = A/ _ 540x10nm 146 =370nm b) Some of the light reflects at the air-oil boundary, and some of the light reflects at the oil- water boundary. At which boundaries will the reflected light wave experience a phase shift? Explain your reasoning (3 points). a. The reflected light wave will experience a phase shift at the air-oil boundary. When the light ray traveling through air reflects off a more optically dense material like oil, the reflected wave will experience a phase shift. Qil is more optically dense than air because it has a larger index of refraction. The light that reflects at the oil-water boundary will not experience a phase shift because the oil has an index of refraction that is larger than water and therefore no light will be able to pass through. reflected light waves to result in total constructive interference (3 points)