Learn about the complex behavior of light polarization when reflecting off metallic mirrors in this 13-minute technical demonstration video. Explore how metallic surfaces with complex refractive indices differently affect P- and S-polarized light, causing linearly polarized light to become elliptically polarized upon reflection. Follow along with detailed experiments using a protected silver mirror at 45° angles, while utilizing specialized equipment including a DIY polarimeter and turnkey polarimeter to measure and visualize polarization states. Master concepts through practical demonstrations of P-polarized, S-polarized, and other linear polarization inputs, complete with Stokes parameter calculations that account for quarter-wave plate retardance for improved accuracy. Gain valuable insights for applications where polarization sensitivity is crucial in optical setups.