In photography and optics, dichroic refers to materials or filters that display two different colours depending on how light interacts with them. One colour is visible in transmitted light (light passing through the material), while a second colour appears in reflected light (light bouncing off the surface).
Dichroic filters and coatings are often used in lighting, projection, and colour separation processes, allowing photographers and filmmakers to create striking visual effects or precise colour control. The unique properties of dichroic materials make them valuable for artistic work, special effects, and advanced optical applications where colour manipulation is required.