General Physics  : A scientist notices that an oil slick floating on

Subject: Physics / General Physics
Question
A scientist notices that an oil slick floating on water when viewed from above has many different rainbow colors reflecting off the surface. 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 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.

Part B

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.

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