chapter  1
20 Pages

The Nature of Light

WithAbdul Al-Azzawi

Humankind has been fascinated with the properties and behaviour of light. Light from the sun served as a catalyst in the formation of life on Earth. Light is widely understood to be one part of a much larger electromagnetic spectrum. The English physicist and mathematician Isaac Newton was the inventor of the particle theory of light. Most scientists accepted the wave theory of light and more theoretical and experimental work was conducted to further explore it. In the context of the wave model, photons are energy packets moving through space and time. All such victories for the photon or particle model of light indicated that light could be treated as a particular kind of matter, possessing both energy and momentum. Many attempts were made to obtain an exact value of the speed of light. In 1849, the first successful laboratory measurement of the speed of light was performed by the French scientist Armand Fizeau.