For a transmission of wave from a dielectric medium of permittivity ε1 into a dielectric medium of lower permittivity ε2 and (ε1 > ε2) the critical angle of incidence θc (relative to the interface) is given by

This question belongs to Electronics And Communications Engineering Electromagnetic Field Theory

Electromagnetic Field Theory

For a transmission of wave from a dielectric medium of permittivity ε₁ into a dielectric medium of lower permittivity ε₂ and (ε₁ > ε₂) the critical angle of incidence θ_c (relative to the interface) is given by

A) $${\sin ^{ - 1}}\sqrt {\frac{{{\varepsilon _2}}}{{{\varepsilon _1}}}} $$ B) $${\cos ^{ - 1}}\sqrt {\frac{{{\varepsilon _2}}}{{{\varepsilon _1}}}} $$ C) $${\tan ^{ - 1}}\sqrt {\frac{{{\varepsilon _2}}}{{{\varepsilon _1}}}} $$ D) $${\sin ^{ - 1}}\sqrt {\frac{{{\varepsilon _1}}}{{{\varepsilon _2}}}} $$

Answer & Solution

Correct Answer: Option A

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