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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 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.
Science and applications is an open access journal that publishes the highest quality articles in basic and applied optics and photonics. The meaning of light is something that makes vision possible How to use light in a sentence But what exactly is light
In order to see, there must be 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…
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. The brightness that comes from the sun, fire, etc
And from electrical devices, and that allows… 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.
