Historically, another important source of light for humans has been fire, from ancient campfires to modern kerosene lamps 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 With the development of electric lights and power systems, electric lighting has effectively replaced firelight.
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Light is a primary tool for perceiving the world and interacting with it for many organisms
About 10 22 joules of solar radiant energy reach earth each day
Light’s interactions with matter have also helped shape the structure of the universe. 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. 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.
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… Is light a wave or a particle And why can’t humans see the whole spectrum of light 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.
