This paper deals with study of optical power of a lidar return from a surface in the atmosphere with a complicated scattering phase function. Expressions that describe the received power from a surface with a scattering phase function having the diffuse and quasispecular components are derived for the case in which sensing is conducted through an optically dense aerosol atmosphere. It is shown that the received power essentially depends on the ratio of the diffuse and quasispecular components of the surface scattering phase function.