This is not normal. If the photon torus is at light speed \(c\), the collapsed spherical particle is at \(c+v_{boom}\). It is faster than the speed of light in the second medium, unless the second medium slows it down sufficiently. The diagram shows the refracted ray bending away from the normal, as its speed is higher.
Which is normal? It does not matter, the point of incident however, is at the contact point of the two particles.
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