The main source of natural light on earth is the sun Visible light is all the colors (red, yellow, blue, etc.) that we can see Historically, another important source of light for humans has been fire, from ancient campfires to modern kerosene lamps
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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 But what exactly is light
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 That is the reason we can see objects during daytime with the sunlight, or with a light bulb in the night. 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. Is light a wave or a particle And why can’t humans see the whole spectrum of light Simply stated, light is nature's way of transferring energy through space
Light travels very rapidly, but it does have a finite velocity. 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
