Electromagnetic Waves Part 1

An EM wave from air enters a medium. The electric fields are

→

E1

=E01

∧

x

cos[2πv(

z

c

−t)] in air and

→

E2

=E02

∧

x

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 ∊r1 and ∊r2 refer to relative permittivities of air and medium respectively, which of the following options is correct ?