Approximately how thick is the film of soap in the reddish region of the fourth stripe indicated? Assume that the film is nearly perpendicular both to your line of sight and to the light rays from the lamp. For simplicity, assume that the region specified corresponds to the fourth maximum of the intensity of reflected red light with a 645 nm 645 nm wavelength. The index of refraction of the soap film is 1.34 1.34 .