One possibility is that the medium the light is supposed to refract from is a metamaterial, an artificially created material with a negative refractive index.
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0(zero) Angle of incidence = angle of reflection
Angle of incidence has to be 0. This means that the ray has to hit normally on the surface of separation of two media
The angle of incidence would be 90 degrees, so the angle of refraction is 0 degrees, as the light ray does not deviate.
The answer is zero. (From Snell's law, if AI in the angle of incidence, AR is the angle of refraction, and n is the refractive index of the material doing the refracting, then: AR = arcsin[(1/n)sin(AI)] =0 if AI=0.
0 degrees