We present experiments demonstrating reciprocity for conjugation of hi
ghly scattered light; if a fraction eta of the total scattered light i
s incident on a phase-conjugate mirror having reflectivity rho, then a
fraction rho eta(2) returns back through the scatterer as a phase-con
jugate wave, with the remaining fraction rho (eta - eta(2)) being lost
due to scattering. Low efficiency results from inability to gather a
large fraction of scattering, but the efficiency is higher than is pos
sible without conjugation.