Ascientist notices that an oil slick floating on water when viewed from above has many different colors reflecting off the surface, making tlook rainbow-like (an effect known as iridescence). She aims a spectrometer at a particular spot and measures the wavelength to be 750 nm (in air). The index of refraction of water is 1.33. Part A The index of refraction of the ol is 1.20. What is the minimum thickness t of the ol slick at that spot? Express your answer in nanometers to three significant figures. > View Available Hint(s) Submit Part B Suppose the oll had an index of retraction of 1.50. What would the minimum thickness t be now? Express your answer in nanometers to three significant figures. > View Available Hint(s) nm

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Diffraction of light

In physics, the term diffraction is defined as the bending of light around the corners of the obstacle. As a light ray passes by an aperture, it bends around the edges or through slits, it spreads out through a narrow opening. The diffracted light will produce fringes of bright and dark or colored bands which are labeled as a diffraction pattern.