One may then consider light as a phenomenon which involves both an electromagnetic field and matter interacting with it, where both play essential roles. For example, slow light with a velocity far below the vacuum velocity of light is observed under certain circumstances. Particularly in cases with strong such interactions, the details of media play a strong role for the observed phenomena. Light is often more than an electromagnetic wave alone.Ī further extension of the concept of light results from the consideration that electromagnetic radiation interacts to some extent with transparent media (e.g. However, in a technological context the term is often used for a substantially broader spectral range which also includes ultraviolet light and infrared light those are not visible, but in many respects have similar physical properties including their propagation. Light in a narrow sense is taken to be electromagnetic radiation in a range of wavelengths where it is visible for human beings, i.e., where it can excite the retina of the human eye to create a visual impression. Today we distinguish visible and invisible light. So light is now understood to be electromagnetic radiation – in most cases it is described with classical theory, however referring to quantum optics (the application of quantum theory to optics) where necessary. Quantum theory was finally developed to obtain a comprehensive description, encompassing both the wave nature and the particle nature of light. Much to the surprise of the scientific community, substantial new evidence for a particle nature was found in the early 20 th century by Albert Einstein. In the 1860s, optical waves were identified with electromagnetic waves by James Clerk Maxwell, further confirming the wave nature. Further systematic experiments, particularly the observation of the so-called Arago spot by Dominique-François-Jean Arago, finally led to the common acceptance of wave optics as a proper description of light. However, increasing evidence for a wave nature of light was collected, leading to the wave theory of Christiaan Huygens, published in 1690, as the foundation of wave optics. In the early history of science, it was common to describe light as a stream of tiny particles, which was seen to be consistent with geometrical optics. Light was originally understood as a phenomenon which can be perceived by human eyes – for a long time, without any understanding of its physical origins. URL: The history of science took quite surprising turns at various points. How to cite the article suggest additional literature More specific terms: monochromatic light, polychromatic light, white light, infrared light, ultraviolet light, laser light, fluorescence light, nonclassical light, fast light, slow light, thermal radiationĬategories: general optics, physical foundations More general term: electromagnetic radiation That is, light can pass through an object with no effect (an x-ray.Definition: electromagnetic radiation in the visible spectral range, or sometimes in an extended spectral region Note: In the natural world, light can also be transmitted by an object. ![]() ![]() All objects have a degree of reflection and absorption. When a light wave strikes an object, it can be absorbed, reflected, or refracted by the object. The color of the objects we see in the natural world is a result of the way objects interact with light.Many beautiful natural phenomenon such as the rainbows, twinkling stars, northern lights etc., occur due to reflective, refractive and diffractive properties of light.To separate white light To know how diffraction occurs in the examples mentioned above-read further. Bending of light at the corners of the door 6. Examples and application of diffraction in real life: 1.Examples Of Diffraction Of Light In Everyday Life Class. ![]() Diffraction refers to those phenomena that occur when a wave encounters a slit or an obstacle.
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