$[0/1$ Points$]$

OSCOLPHYS$201627\mathrm{.}7.$WA$\mathrm{.}048.$

Calculate the minimum thickness of an oil slick on water that appears blue when illuminated by white light perpendicular to its surface. Take the blue wavelength to be $461$ nm and the index of refraction of oil to be $1\mathrm{.}49.$ The index of refraction of water is $1\mathrm{.}33.$

$7$

What is thin film interference? How many phase shifts are there? What is the condition for constructive interference? nm

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