Question

8 a) Which direction does an EM wave travelling from a denser medium (higher refractive index) to a rarer medium (lower refractive index) refract to with respect to the normal to the media boundary?

8 b) What are the possible values of the phase angle of the reflection coefficient (θr) when the and electromagnetic wave travels from one lossless dielectric medium to another lossless dielectric medium at normal angle of incidence?

8 c) A plane wave travels from medium 1 to medium 2 with normal angle of incidence. Both material media are non-magnetic and non-conducting with εr1 = 4 and εr2 = 9. The incident Electric field is given by Ei (z,t) = x̂ 5 cos(4π×109 t - 20π z) V/m. Calculate η1, η2, Γ and τ for the materials to find the time domain electric and magnetic fields in each media.

Answer 1