Multiple choice

A medium of relative permittivity $\epsilon_{r2}$ = 2 forms an interface with free-space. A point source of electromagnetic energy is located in the medium at a depth of 1 metre from the interface. Due to the total internal reflection, the transmitted beam has a circular cross-section over the interface. The area of the beam cross section at the interface is given by

  1. 2$\pi$ m2
  2. $\pi$2 m2
  3. $\frac{\pi}{2}$ m2
  4. $\pi$m2
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D Correct answer
Explanation

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