Möller prism

A Möller prism is a specialized optical device used to analyze the polarization of light, often in scientific instruments. It is shaped with two equal prisms joined together, designed to split and then recombine light so that the final output is either the same or rotated in polarization. When unpolarized or polarized light passes through, the prism selectively filters and changes the polarization state, allowing researchers to study properties of materials or light sources. Its ability to manipulate polarization without affecting the light's path makes it useful in optical measurements and research.