GATE EC 2007 Electromagnetics Solution Q 6

GATE EC 2007 Electromagnetics Solution Q 6

A Right Circularly Polarized (RCP) plane wave is incident at an angle of 60 degree to the normal, on an air-dielectric interface. If the reflected wave is linearly polarized, the relative dielectric constant \in_{r_2}
is

GATE EC 2007 Electromagnetics Solution img3 - Grad Plus

(a) \sqrt2

(b) \sqrt3

(c) 2

(d) 3

Ans : (d)

Explanation

As reflected light is polarized light, according to Brewster Law, we have the angle of incidence is Brewster angle.

\tan\left(\theta_B\right)={}^1\mu_2=\frac{\varepsilon_{r2}}{\varepsilon_{r1}} \tan60^0=\sqrt{\frac{\in_{r_2}}1} \sqrt3=\sqrt{\in_{r_2}} \therefore\in_{r_2}=3

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