Red Filter
A red filter smaller than the illumination beam allows peripheral unfiltered light to reach a beam splitter, generating a yellow edge halo. The outgoing polarized beam produces sharp geometric images of the filter mount, replicated across the splitter faces due to internal reflections and optical beam division.
—Image by José Armando Escamilla, Universidad Politécnica de Tulancingo, supervised by advisor Ana Karen Reyes in the lab of Noel Ivan Toto Arellano, Universidad Tecnológica de Tulancingo, Mexico
