There are certain materials developed in laboratories which have a negative refractive index, Fig. A ray incident from air (medium 1) into such a medium (medium 2) shall follow a path given by
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There are certain material developed in laboratories which have a negative refractive index (See figure). A ray incident from air (medium 1) into such a medium (medium 2) shall follow a path given by

When a ray of light passes from air medium to denser medium then the refractive index is

Refraction index of medium-2 with respect to medium-1 is ...... .

x-y plane separates two media, zge0 contains a medium of refractive index 1 and zle0 contains a medium of refractive index 2. A ray of light is incident from first medium along a vector hati+hatj-hatk . Find the unit vector along the refracted ray.