👉 A krater, also known as a mirror or reflective surface, is a shape created by reflecting light. It can be made of glass, crystal, metal or any other material with a clear or partially transparent surface. The surface of the krater may appear to have an almost spherical shape and can reflect light in various directions depending on its size and thickness. Kraters are used in many applications such as astronomy, photography, optical instruments, and industrial processes where they help to focus light onto a screen