Electromagnetic waves emanating from a point | vedclass

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(C) The correct option is $(C)$.In the given diagram,the incident ray and the refracted ray lie on the same side of the normal at the interface. Accor

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if the material has a refractive index less than zero

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(C) The correct option is $(C)$.In the given diagram,the incident ray and the refracted ray lie on the same side of the normal at the interface. According to Snell's Law,$n_1 \sin(i) = n_2 \sin(r)$.If the light travels from air $(n_1 = 1)$ to a medium $(n_2 = n)$,then $\sin(i) = n \sin(r)$.In the provided figure,the angle of refraction $r$ is on the opposite side of the normal compared to standard refraction,which mathematically implies that the refractive index $n$ must be negative.Materials with a negative refractive index are known as Negative Index Metamaterials $(NIM)$. In these materials,the phase velocity is directed opposite to the group velocity (Poynting vector),leading to negative refraction as shown in the diagram.

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