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The Nature of Light

George Asimellis

Published Aug 13, 2020• 0 citations
Publisher

Abstract

The very nature of light has been the subject of philosophical consideration since antiquity. As a physical entity, many people have suggested that light has a corpuscular nature, formed of particles, while others have proposed a wave nature instead. Physical entities can be classified as either waves or particles. Waves spread out in space (diffraction), can pass through obstacles, and can be added to other waves (superposition). Particles, on the other hand, move in straight lines due to their inertia unless a force is exerted upon them. If they encounter an obstacle, they simply reverse direction. Light has both properties at the same time! So the questions to ask are: How is light classified? What is light, which we cannot see, but thanks to it, we see?

DOI
10.1117/3.2318475.ch1

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The very nature of light has been the subject of philosophical consideration since antiquity. As a physical entity, many people have suggested that light has a corpuscular nature, formed of particles, while others have proposed a wave nature instead. Physical entities can be classified as either waves or particles. Waves spread out in space (diffraction), can pass through obstacles, and can be added to other waves (superposition). Particles, on the other hand, move in straight lines due to their inertia unless a force is exerted upon them. If they encounter an obstacle, they simply reverse direction. Light has both properties at the same time! So the questions to ask are: How is light classified? What is light, which we cannot see, but thanks to it, we see?
Have you ever tried to define light? If so, your definition is probably related to vision, the ability to see things. The Merriam-Webster English dictionary defines light as “something that makes vision possible”. However, the definition of the “nature of light” is a complex term already discussed by philosophers of Ancient Greece. In the 17th century, the debate on the matter focused on whether light was a particle or a wave, based on the different properties of light that had been gradually discovered over time. Isaac Newton (1642−1727) was a defender of the corpuscular theory of light, which considered light to be formed by particles, i.e., small pieces of matter, like dust or grains of sand. He was the author of Opticks (1706), the front cover of which appears in Fig. 1.1. Christian Huygens (1629–1695), on the other hand, supported the theory that light is a wave. These are two completely different definitions of the same physical concept. A range of experiments were developed to attempt to clarify this dilemma, but it was only until 1900 when Max Planck (1858-1947) introduced the basis of a theory that would go on to revolutionize scientific thinking, marking the beginning of modern physics: quantum theory. Developed during the 20th century thanks to advances made by scientists such as Niels Bohr, Born, Heisenberg, Schrödinger, Pauli, Dirac, Einstein or de Broglie, quantum theory clarified that light is neither a particle nor a wave, but that it has a dual nature: it behaves like a wave as it spreads but like a particle in its interactions with matter. In this book, we will specify where necessary whether light behaves as a particle or as a wave, although in most cases we refer to rays of light, which always represent the direction of propagation of light.
Light - the physicists' problem. The nature of light was the subject \nof such controversy ever since two schools of thought - one led by Newton, \nthe other by Huyghens - had proposed two different viewpoints of the nature \nof light. Newton viewed light as a stream of discrete particles while Huyghens \nmaintained that light was a form of wave-motion. As any O-level student \nknows, experimentation involving wave-properties such as diffraction (the \nfamous Young's slits experiments) eventually proved as correct Huyghens' \nidea of light as waves passing through a continium, which was eventually shown \nto be space itself by the Scot, James Clerk-MaxwelI in his work on electromagnetic \nradiation. By the end of the 19th Century, it seemed that light presented no problem. Light was waves.
In the process of exploring the essence of light, Newton initially agreed with the particle interpretation of light while Huygens argued for the wave theory. Hence, these two theories had been disputed in Newton’s time. In the beginning people accepted the particle theory, but after Thomas Young’s experiment and Augustin Jean Fresnel’s experiment, people began to accept the wave theory. Until Einstein proposed the quanta concept, which was later called photon, and, even later, De Broglie proposed the wave nature of matter, subsequently, people began using particle-wave duality to explicate all phenomena in micro world. Thus here appears a paradox: how can one particle exist in two forms? To solve this enigma, I have done some experiments; discover that moving photons create force; this effect reveal the phenomenon of light wave property - the inference fringes is caused by force which moving photons produced. The essence of light is particle but not particle-wave duality.
In the process of exploring the essence of light, Newton initially agreed with the particle interpretation of light while Huygens argued for the wave theory. Hence, these two theories had been disputed in Newton's time. In the beginning people accepted the particle theory, but after Thomas Young's experiment and Augustin Jean Fresnel's experiment, people began to accept the wave theory. Until Einstein proposed the quanta concept, which was later called photon, and, even later, De Broglie proposed the wave nature of matter, subsequently, people began using particle-wave duality to explicate all phenomena in micro world. Thus here appears a paradox: how can one particle exist in two forms? To solve this enigma, I have done some experiments; discover that moving photons create force; this effect reveal the phenomenon of light wave property - the inference fringes is caused by force which moving photons produced. The essence of light is particle but not particle-wave duality.