Find the fundamental units involved in the following derived units? (i) Newton,(ii)watt,(iii) joule,(iv)cubic meter ​

What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 480 ? the index of refraction of the film is 1.34, and there is air on both sides of the film. express your answer in nanometers. hint 1. how to approach th