A light beam splitter is a device that uses a PRISM to divide a single beam of light into two or more separate beams. A PRISM is a transparent optical element with flat, polished surfaces that refract light. The light beam splitter works by using the refraction of light through the PRISM to split the beam into multiple beams. This can be used for a variety of applications, such as creating multiple images from a single source or splitting a beam of light into its component colors.