What does the term "diffuse" mean in optical contexts?

In optical contexts, the term "diffuse" refers to the process of spreading or scattering light, which helps in understanding various phenomena related to how light interacts with surfaces and materials. When light is diffused, it means that rather than traveling in straight lines and forming sharp shadows, the light rays are scattered in many directions. This scattering can result in softer lighting effects, reduce glare, and create a more even illumination across a surface.

For example, when light hits a rough or matte surface, it is diffracted, leading to a more uniform light distribution rather than reflecting sharply. This understanding is crucial in fields like photography, optics design, and interior lighting, where controlling the quality and distribution of light is essential for achieving the desired effects in images or environments.