Visible light is all the colors (red, yellow, blue, etc. Historically, another important source of light for humans has been fire, from ancient campfires to modern kerosene lamps. But there are many other kinds… The study of light and its interaction with matter is termed optics. The main source of natural light on Earth is the Sun. These waves are all around us and come in many sizes. When light hits a transparent object, it passes through it almost completely without making a significant shadow. 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. That is the reason we can see objects during daytime with the sunlight, or with a light bulb in the night. ) that we can see. Light is a type of energy that enables us to see with our eyes. Each lesson includes informative graphics, occasional animations and videos, and Check Your Understanding sections that allow the user to practice what is taught. In order to see, there must be light. Oct 25, 2021 · Is light a wave or a particle? How is it created? And why can’t humans see the whole spectrum of light? All your questions answered. Light is a form of electromagnetic radiation that shows properties of both waves and particles. 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. . Dec 29, 2025 · Light is electromagnetic radiation that can be detected by the human eye. Light shines on an object, then bounces off, or reflects, back to our eyes. The main source of natural light on Earth is the Sun. Light travels from a source, like the sun or a light bulb, to our eyes, and to the surroundings. Our eyes are sensitive to a certain kind of light called visible light. 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. 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 is just one form of electromagnetic radiation, or electromagnetic waves.

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