Engineers are testing a new thin-film coating whose index of refraction is less than that of glass. They deposit a 480-nm-thick layer on glass, then shine lasers on it. A red laser with a wavelength of 640 nm has no reflection at all, but a violet laser with a wavelength of 400 nm has a maximum reflection. How the coating behaves at other wavelengths is unknown. ▾ Part A What is the coating's index of refraction? ne 11 V ΑΣΦ ?

Engineers are testing a new thin-film coating whose index of refraction is less than that of glass. They deposit a 480-nm-thick layer on glass, then shine lasers on it. A red laser with a wavelength of 640 nm has no reflection at all, but a violet laser with a wavelength of 400 nm has a maximum reflection. How the coating behaves at other wavelengths is unknown. ▾ Part A What is the coating's index of refraction? ne 11 V ΑΣΦ ?