  One phenomenological explanation of superluminal propagation of neutrinos,
which may have been observed by OPERA and MINOS, is that neutrinos travel
faster inside of matter than in vacuum. If so neutrinos exhibit refraction
inside matter and should exhibit other manifestations of refraction, such as
deflection and reflection. Such refraction would be easily detectable through
the momentum imparted to appropriately shaped refractive material inserted into
the neutrino beam. For NuMI this could be as large as ~10g cm/s. If these
effect were found, they would provide new ways of manipulating and detecting
neutrinos. Reasons why this scenario seems implausible are given, however it is
still worthwhile to conduct simple searches for differential refraction of
neutrinos.
