Question

define ray and describe it working​

Answer 1

Answer:

Ray. Definition: A portion of a line which starts at a point and goes off in a particular direction to infinity. ... The point where the ray starts is called (confusingly) the endpoint. On its way to infinity it may pass through one or more other points. In the figure above, the ray starts at A and also passes through B.

Answer 2

Answer:

each of the lines in which light (and heat) may seem to stream from the sun or any luminous body, or pass through a small opening.