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A student shines a variable light source directly onto a thin film of oil that is...

A student shines a variable light source directly onto a thin film of oil that is on the surface of a piece of plastic. The oil has an index of refraction of 1.62 while the plastic has an index of refraction of 1.44. The student adjusts the light source until the first bright reflection occurs, which they note occurs when the wavelength is 560 nm.
Q1. At which if any does the light undergo a 180 phase change on reflection? justify answer.
air-oil interface oil-plastic interface both interfaces neither interfaces

Q2. determine the frequency of the light in the air.

Q3. calculate the minimum possible thickness of the oil film.



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