3. In order to achieVe total transmission from air into glass a dielectric coating is applied to the glass surface. If the glass has a relative permittivity, e,- = 2.6 and we wish to transmit a wavelength of 570 nm determine: (a) (10 points) the required permittivity of the coating layer. (b) (10 points) the minimum thickness (in meters) for the coating layer. . 9141'; QJV na a' rZJCg a:?ua '1 )1,- J13