Question: Engineers are testing a new thin - film coating whose index of refraction is less than that of glass. They deposit a layer 6 9

Engineers are testing a new thin-film coating whose index of refraction is less than that of glass.
They deposit a layer 691 nm thick on the glass, then shine lasers on it.
A red laser with a wavelength of 682 nm has no reflection at all, but a violet laser with a wavelength of 426 nm has a maximum reflection.
How the coating behaves at other wavelengths is unknown.
What is the coatings index of refraction?

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