A medium of relative permittivity ε_r2 = 2 form an interface with free-space. A point source of electromagnetic energy is located in the medium at depth of 1 meter 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

A. 2π m²

B. π²m²

C. $$\frac{\pi }{2}{{\text{m}}^2}$$

D. π m²

Answer: Option D