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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. 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. 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…
But what exactly is light
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.
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
