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(D) For total internal reflection to occur,the angle of incidence $i$ must be greater than the critical angle $	heta_{C}$.The refractive index of a m

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$60$

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(D) For total internal reflection to occur,the angle of incidence $i$ must be greater than the critical angle $	heta_{C}$.The refractive index of a medium is given by $\mu = \sqrt{\mu_{r} \epsilon_{r}}$.For the given medium: $\mu_{D} = \sqrt{1 	imes 4} = 2$.For air: $\mu_{R} = 1$.The critical angle $	heta_{C}$ is defined as $\sin 	heta_{C} = \frac{\mu_{R}}{\mu_{D}} = \frac{1}{2}$.Therefore,$	heta_{C} = 30^{\circ}$.For total internal reflection,$i > 	heta_{C}$,which means $i > 30^{\circ}$.Among the given options,$60^{\circ}$ is the only value greater than $30^{\circ}$ that satisfies the condition for total internal reflection.

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