Which type of reflection occurs off a smooth surface?

Specular reflection occurs off a smooth surface, such as a mirror or calm water. When light rays hit a smooth surface, they are reflected at a consistent angle, allowing for a clear image to be seen. This phenomenon is why we can see precise reflections in flat, shiny surfaces.

In contrast, diffuse reflection occurs on rough or uneven surfaces, where light is scattered in many directions, preventing you from forming a distinct image. Regular reflection is not a standard term used in physics to describe the behavior of light, and angular reflection is also not commonly recognized in the context of light behavior. Thus, specular reflection is the correct term for reflection from a smooth surface, leading to clear images or reflections.