The reflection and transmission of light from a turbid slab is determined by considering a photon random walk within the medium. The reflection and transmission is obtained using the Beer-Lambert law on each path through the slab. Path length probability densities are derived, then all paths are summed weighted by their probabilities. The results are simple expressions for the reflection and the transmission in terms of the physical properties of the medium. (c) 2016 Wiley Periodicals, Inc. Col Res Appl, 41, 580-584, 2016