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Light - Wikipedia The main source of natural light on Earth is the Sun Historically, another important source of light for humans has been fire, from ancient campfires to modern kerosene lamps With the development of electric lights and power systems, electric lighting has effectively replaced firelight
Light | Definition, Properties, Physics, Characteristics . . . What is light in physics? Light is electromagnetic radiation that can be detected by the human eye Electromagnetic radiation occurs over an extremely wide range of wavelengths, from gamma rays with wavelengths less than about 1 × 10 −11 metres to radio waves measured in metres
How Light Works - HowStuffWorks But what exactly is light? We catch glimpses of its nature when a sunbeam angles through a dust-filled room, when a rainbow appears after a storm or when a drinking straw in a glass of water looks disjointed
Light - New World Encyclopedia The study of light and its interaction with matter is termed optics The observation and study of optical phenomena such as rainbows and the aurora borealis offer many clues about the nature of light as well as much enjoyment
Light - Energy Education Light is a form of electromagnetic radiation, which means it has electric fields and magnetic fields vibrating back and forth very quickly as a wave Because of the strangeness of quantum mechanics, light is also made of little particles with no mass, called photons
Light - Encyclopedia. com Light, of course, is more than color: it is energy, which travels at incredible speeds throughout the universe From prehistoric times, humans harnessed light's power through fire, and later, through the invention of illumination devices such as candles and gas lamps
The Basics of Light - Johns Hopkins University Simply stated, light is nature's way of transferring energy through space We can complicate it by talking about interacting electric and magnetic fields, quantum mechanics, and all of that, but just remember-- light is energy Light travels very rapidly, but it does have a finite velocity