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Q.

The Critical angle of a medium for a specific wavelength, if the medium has relative permittivity 3 and relative permeability $\frac{4}{3}$ for this wave length, will be(in degrees) ______.

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answer is 30.

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Detailed Solution

As, $n = \sqrt{μ_{r} ε_{r}} = \sqrt{\frac{4}{3} \times 3} = 2$

And, ${sinθ}_{c} = \frac{1}{n} = \frac{1}{2}$

$∴$ Critical angle $θ_{C} = 30^{0}$

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