How spherical phase fronts come towards PIM-NIM surface.
This shows how spherical phase fronts that
satisfy a negative Snell's law come towards the PIM-NIM surface, rather
than crossing it from left to right.
These cannot be interpreted as anything going from left to right, i.e.,
this does not represent causal front propagation and focusing as claimed
If you still do not believe how simple but true this is, try to find
anything that is going from the left to the right of the surface in this movie that would
correspond to the right-moving arrow on the rays you see in all ray
diagrams depicting NIM focusing.
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