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
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. 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. 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
Introduction light, visible electromagnetic radiation Of the entire electromagnetic spectrum, the human eye is sensitive to only a tiny part, the part that is called light The wavelengths of visible light range from about 350 or 400 nm to about 750 or 800 nm The term “light” is often extended to adjacent wavelength ranges that the eye cannot detect—to infrared radiation, which has a.
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