If Ri is parallel to the normal then Rr = N, that is, the reflected ray is in the opposite direction to the incident ray. If the incident ray is perpendicular to the normal then it is unaffected, Rr = Ri, this is a glancing ray.
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it travels in opposite direction
If Ri is parallel to the normal then Rr = N, that is, the reflected ray is in the opposite direction to the incident ray. If the incident ray is perpendicular to the normal then it is unaffected, Rr = Ri, this is a glancing ray.