A concave mirror can converge a parallel beam of light to a point. The reflection taking place, in this case, is a regular reflection.
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Regular reflection is a reflection in which all the incident parallel rays of light remains parallel after reflection from the reflecting surface. In case of concave mirrors, the parallel beam of light is converged to a point after reflection and hence ceases to be a parallel beam of light. Thus, the reflection is not regular, but an irregular one.