17. Conclusion

Light is a special kind of radiation composed of electric and magnetic fields which are vibrating at right angles to the direction of its propagation and also perpendicular to each other. Light is an electromagnetic radiation that shows properties of both waves and particles. Light exists in tiny energy packets called photons.

In 1900, Max Plank had attempting to explain black-body radiation suggesting that although light was a wave, in which these waves could gain or lose energy only in finite amounts related to their frequency. Plank called these finite amount of light energy as “quanta”. In 1905, Albert Einstein used these quanta concept to explain the photoelectric effect supporting that quanta has a real existence. In 1926, Gilbert. N. Lewis named these little quanta particles as “Photons”.

Eventually the modern theory of quantum mechanics came to picture light as both a particle or a wave. Visible light which can be easily shown in experiments to be describable using either a wave or a particle model or sometimes both.