If a light ray incident normally on one of the faces of a Prism of refractive index 2 and the emergent ray just graces the second face of the prism, then the angle of deviation is?

Q. A ray of light incident normally on the horizontal face of the slab and just fail to emerge from the diagonal face of the prism. If prism angle is ${30}^o$ then refractive index of the prism can be

Q. A ray of light is incident normally on one of the faces of a prism of apex angle 30° and refractive index √2 . The angle of deviation of the ray is:

Q. A ray is incident at a small angle of incidence $i$ on one face of a prism with angle of prism $6^{\circ }$ and emerges from the second face. If the prism is dipped in transparent liquid of refractive index $1.2$ and angle of deviation is $2^{\circ }$, then what is the refractive index of prism material?