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 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. The meaning of light is something that makes vision possible How to use light in a sentence
Light is a transverse, electromagnetic wave that can be seen by the typical human The wave nature of light was first illustrated through experiments on diffraction and interference. In most situations, light behaves like a wave with properties like wavelength and frequency, and is subject to diffraction and interference In some situations, light can be considered to behave like a particle called a photon This particle has no mass, but carries a fixed amount of energy. But what exactly is light
Light shines on an object, then bounces off, or reflects, back to our eyes Our eyes are sensitive to a certain kind of light called visible light Visible light is all the colors (red, yellow, blue, etc.) that we can see But there are many other kinds… Is light a wave or a particle And why can’t humans see the whole spectrum of light
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. In this international year of light, it is particularly appropriate to review the historical concept of what is light and the controversies surrounding the extent of the visible spectrum Today we recognize that light possesses both a wave and. Light is a type of energy that enables us to see with our eyes Light travels from a source, like the sun or a light bulb, to our eyes, and to the surroundings
