Abstract
This chapter discusses the properties of light rays. Light is an electromagnetic wave and the straight line paths followed by very narrow beams of light, along which light energy travels, are called rays. The behavior of light rays may be investigated by using a ray box. This consists merely of a lamp in a box containing a narrow slit that emits rays of light. Light always travels in straight lines although its direction can be changed by reflection or refraction. A ray of light, called the incident ray, striking a plane mirror and making an angle with the normal that is a line drawn at right angles to the mirror is called the angle of incidence. The light ray reflects making an angle with the normal and is called the angle of reflection. There are two laws of reflection—(1) the angle of incidence is equal to the angle of reflection; and (2) the incident ray, the normal at the point of incidence, and the reflected ray all lay in the same plane.
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