A ray passing through the principal focus of a concave mirror will, after reflection:
emerge parallel to the principal axis
Reflection is reversible: a ray travelling parallel to the principal axis of a concave mirror is reflected through the principal focus, so a ray that arrives along the reverse of that path must leave along the reverse of the first.
A ray directed through the principal focus therefore comes back parallel to the principal axis after reflection. Only a ray aimed at the centre of curvature returns along its own path, since it strikes the mirror along the normal.
Hence, the answer is emerge parallel to the principal axis.
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