EC > GATE 2018 > Plane Waves
A uniform plane wave traveling in free space and having the electric field E=(√2âx-âz)cos[6√3π×108t-2π(x+√2z)]V/m is incident on a dielectric medium (relative permittivity > 1, relative permeability = 1) as shown in the figure and there is no reflected wave. 
The relative permittivity (correct to two decimal places) of the dielectric medium is
Correct : 2
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