It is called a beam.
Light rays coming in are called incident light rays.
The light rays that bounce back are called reflected light rays.
Solar energy
A broad bundle of light rays is called a beam.
The point where light rays meet is called the focal point.
A collection of rays is called a ray bundle.
A collection of rays is commonly referred to as a "pencil of rays." In geometrical optics, this term describes a group of rays that emanate from a single point or a common origin, often used to analyze light propagation and behavior in lenses and mirrors.
Light rays coming in are called incident light rays.
rainbow
The light rays that bounce back are called reflected light rays.
Solar energy
A broad bundle of light rays is called a beam.
The point where light rays meet is called the focal point.
The bouncing of light rays is called reflection. When light rays strike a surface and return back in the same direction, it is known as reflection.
A group of rays is called a "bundle of rays." In optics, this term is often used to describe a collection of light rays that are traveling in similar directions, which can be relevant in the study of lenses, mirrors, and other optical systems. In other contexts, such as physics or geometry, a group of rays originating from a common point may also be referred to as a "fan of rays" or simply a "ray cluster."
I believe you want to ask: what are the so-called "bounced-off" rays of light called? If so, the simplest answer would be: "reflections".
The light rays that leave a mirror are called reflected rays. They are the result of light bouncing off the mirror's surface at an equal angle to the incident angle.