Ray of light: The direction or path along which light energy travels in a medium is called a ray of light. It is represented by a straight line with an arrow marked on it.
Beam of light: A group of light rays is called a beam of light. A beam of light may be parallel, convergent or divergent, as shown in Fig.
Fig. Different beams of light
The rays from a distant light source (such as the sun) are parallel to each other, they constitute a parallel beam. In a convergent beam, the rays proceed towards a point. In a divergent beam, the rays proceed away from a point.
Define the following terms in connection with reflection of light:
Incident ray, reflected ray, point of incidence, normal, angle of incidence and angle of reflection.
