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When a plane wave travelling in free-space is incident normally on a medium having $\varepsilon_{t}=4.0$, then fraction of power transmitted into the medium is given by

  1. $\frac{8}{9}$
  2. $\frac{1}{2}$
  3. $\frac{1}{3}$
  4. $\frac{5}{6}$
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