An EM wave from air enters a medium.
Channel: Doubtnut
Date: 2020-01-03

An EM wave from air enters a medium. The electric fields are `overset(vec)E_(1)=E_(01)hatx cos[2piv((z)/(c )-t)]` in air and `overset(vec)E=E_(02)hatx cos [k(2z-ct)]` in medium, where the wave number k and frequency v refer to their values in air. The medium is non-magnetic. If `in_(r_(1))` and `in_(r_(2))` refer to relative permittivities of air and medium respectively, which of the following options is correct ?