What Is Rectilinear Propagation Of Light Usually light travels in a straight line. When we want to represent the propagation of light with a diagram, we represent it with the help of rays and beams. Ray A ray is a line with an arrow that shows the direction of propagation of light, and such a diagram is called a ray diagram. Beam A group of light rays moving in an organized … [Read more...] about What Is Rectilinear Propagation Of Light