chapter  2
The nature of light
Pages 26

In this chapter we shall be discussing the fundamentals of light itself. We shall examine the nature of light, how it behaves, the ways in which it varies, the principles of color.

What is light? Radiant energy is emitted from many natural and man-made sources, including the sun, radioactive ores, radio transmitters, electric lamps ... It travels out through space in the form of electromagnetic radiation (waves of energy with associated electric and magnetic fields) at the incredible speed of over 186000 miles a second (3 X 1010 cmls).