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Learning Goal: Thin film Interference A scientist notices that an oil slick floating on water when viewed from above has many different colors reflecting off the surface, making it look 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. incident light 1.00 oil riwator - 1.33

New situation: Suppose the oil had an Index of refraction of 1.60. It is desired that the wavelength of 750nm (in alr) has destructivo Interference in the reflection Part C. New situation: What would the minimum thickness t be? ΡΟ ΑΣΦ ? mm from Submit Request Answer New situation - backward: Now assume that the oil had a thickness of 200 nm and an index of retraction of 1.5. You will find the longest wavelength (in air) that has either constructive or destructive interference in reflection Part D-Now assume that the oil had a thickness of 200 nm and an index of refraction of 1.5. What is the longest wavelength in air that has constructive interefence in reflection? (This is backward to Part B.) Express your answer in nanometers. View Available Hint(s) Ή ΑΣΦ

Submit Part E. Now assume that the oil had a thickness of 200 nm and an index of refraction of 1.5. a What is the longest wavelength in air that has destructivo intoretence in reflection? (This is backward to PartC.) View Available Hint(s) VO ΑΣΦ» OWO Larr longost nim Submit Part F. Now assume that the oil had a thickness of 200 nm and an index of retraction of 1.5. What is the 2nd longest wavelength in air that has destructive interefence in reflection? θI ΑΣφ ? nm Loir 2nd longest = Submit Request Answer

New situation: Suppose the oil had an Index of refraction of 1.50. It is desired that the wavelength of 750nm (in air) has destructive Interference in the reflection, Part C. New situation: What would the minimum thickness t be? ΡΟ ΑΣφ ? mm min Submit Request Answer New situation - backward: Now assume that the oil had a thickness of 200 nm and an index of refraction of 1.5. You will find the longest wavelength (in air) that has either constructive or destructive interference in reflection. Part D-Now assume that the oil had a thickness of 200 nm and an index of refraction of 1.5. What is the longest wavelength in air that has constructive interefence in reflection? (This is backward to Part B.) Express your answer in nanometers. ► View Available Hint(s) Ή ΑΣφ