A) \[60{}^\circ \]
B) \[45{}^\circ \]
C) \[15{}^\circ \]
D) \[30{}^\circ \]
Correct Answer: D
Solution :
| [d] For relative permittivity \[=3,\text{ }\varepsilon =3{{\varepsilon }_{0}}\] |
| For relative permeability \[=\frac{4}{3},\mu =\frac{4}{3}{{\mu }_{0}}\] |
| \[\therefore \mu \varepsilon =4{{\mu }_{0}}{{\varepsilon }_{0}}\] |
| \[\sqrt{\frac{{{\mu }_{0}}{{\varepsilon }_{0}}}{\mu \varepsilon }}=\frac{v}{c}=\frac{1}{2}\] |
| \[\sin {{\theta }_{c}}=\frac{1}{2}\] |
| \[\therefore {{\theta }_{c}}=30{}^\circ \] |
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