In this project, we will build an interferometric scattering microscope with polarization resolution. Interferometric scattering microscopy is a recent technique that exploits the interference between scattered light from a small object and reflected light from a substrate to create contrast for samples as small as a single protein. We will apply the microscope to image and characterize the morphology of nanoscale objects of interest in the field of biochemistry, amongst other potential applications. The goal is to obtain quantitative information about the size and three-dimensional conformation of a variety of samples by adding fine polarization measurements to interferometric scattering microscopy.