Collection of Rays is called a Beam.

Explanation:
A Beam is a collection of rays of light that travel in the same direction. When light is emitted from a source, it spreads out in all directions as rays. These rays of light can be thought of as straight lines that represent the path of light. When these rays are grouped together and travel parallel to each other, they form a beam.

- A Shadow is a dark area created when an object blocks light. It is not a collection of rays but rather the absence of light caused by an object blocking the light source.
- A Photon is a particle of light. While photons are the fundamental units of light, they do not refer to a collection of rays.
- An Image is a picture or representation of an object formed by the rays of light that reflect off it and enter our eyes. An image is formed when rays of light pass through a lens or reflect off a mirror and converge to form a picture. It is not a collection of rays itself.

In summary, a Beam refers to a collection of rays of light that travel in the same direction. It is formed when rays of light are grouped together and travel parallel to each other.