Question: Engineers are testing a new thin - film coating whose index of refraction is less than that of glass. They deposit a 7 2 0

Engineers are testing a new thin

-

film coating whose index of refraction is less than that of glass. They deposit a

720 -

nmnm

-

thick layer on glass, then shine lasers on it

.

A red laser with a wavelength of

640

nmnm has no reflection at all, but a violet laser with a wavelength of

400

nmnm has a maximum reflection. How the coating behaves at other wavelengths is unknown.

Part A

What is the coating's index of refraction?

Activate to select the appropriates template from the following choices. Operate up and down arrow for selection and press enter to choose the input value typeActivate to select the appropriates symbol from the following choices. Operate up and down arrow for selection and press enter to choose the input value type

nCnC

=

. 370

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