A scientist notices that an oil slick floating on water whenviewed from above has many different colors reflecting offthe surface, making it look rainbow-like (an effect known asiridescence). She aims a spectrometer at a particular spotand measures the wavelength to be 750 nm (in air). Theindex of refraction of water is 1.33.Part AThe index of refraction of the oil is 1.20. What is the minimum thickness t of the oil slick at that spot?Express your answer in nanometers to three significant figures.► View Available Hint(s)VT ΑΣΦt =SubmitPart Bt =Suppose the oil had an index of refraction of 1.50. What would the minimum thickness t be now?Express your answer in nanometers to three significant figures.► View Available Hint(s)Submit?VE ΑΣΦnm?nm

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