Find the critical angle of a medium for a specifie wavelength, if the medium has relative permittivi

Question

Find the critical angle of a medium for a specifie wavelength, if the medium has relative permittivity 3 and nelative permeability $\frac{4}{3}$ for this warelength.

Professor PC Thomas Classes · Answer

$n = \sqrt{\epsilon_r \mu_r} = \sqrt{3 	imes 4/3} = 2$. Critical angle $\sin 	heta_c = 1/n = 0.5 \Rightarrow 30^{\circ}$.