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A right circularly polarized (RCP) plane wave is incident at an angle of $60^{\circ}$ to the normal, on an air-dielectric interface. If the reflected wave is linearly polarized, the relative dielectric constant $\varepsilon_{r 2}$ is

  1. $\sqrt{2}$
  2. $\sqrt{3}$
  3. $2$
  4. $3$
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