Expressions for the power radiated by either a dipole or a quadrupole reflected in an infinite rigid plane are presented. These expressions are perfectly general in that they admit any orientation of the multipole and any kind of a quadrupole. The results include the special cases considered previously by U. Ingard and G. L. Lamb, Jr. [J. Acoust. Soc. Am.29, 743 (1957)]. The large variations in radiated power observed for a single multipole tend to diminish when averages over a distribution of such multipoles are considered.