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
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: Option A
This Question Belongs to Electronics And Communications Engineering >> Electromagnetic Field Theory
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