Light bulb keeps turning on and off, Feb 6, 2026 ยท Light is electromagnetic radiation that can be detected by the human eye. The main source of natural light on Earth is the Sun. 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. LIGHT definition: something that makes things visible or affords illumination. . Light is just one form of electromagnetic radiation, or electromagnetic waves. Historically, another important source of light for humans has been fire, from ancient campfires to modern kerosene lamps. We can complicate it by talking about interacting electric and magnetic fields, quantum mechanics, and all of that, but just remember-- light is energy. These waves are all around us and come in many sizes. Simply stated, light is nature's way of transferring energy through space. Light travels very rapidly, but it does have a finite velocity. With the development of electric lights and power systems, electric lighting has effectively replaced firelight. The largest electromagnetic waves, with wavelengths from a few centimeters to over 100 meters are called radio waves. The main source of natural light on Earth is the Sun. 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 in physics, its properties, colours, and behaviour, including reflection, refraction, and optics explained clearly. See examples of light used in a sentence.
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