Meaning of Light

What is Light:

Light is electromagnetic radiation and we generally refer to that which is visible to us. The light is transmitted in the form of waves whose reflection illuminates the surfaces allowing us, in this way, see the objects and colors around us.

visible spectrum light

The colors that the human eye can distinguish are located within what is called the visible spectrum of light.

In this sense, light is manifested by wavelengths, at the end of the longer waves we have the type of radiation such as radio waves, and at the end of the shorter waves are gamma rays. Both ends of the spectrum are invisible to human vision.

The ways in which light propagates are defined in what is known as the electromagnetic spectrum. Visible light lies between infrared light and ultraviolet light.

What light source we refer to everything that originates energy, either in visible or invisible terms, such as:

  • the sun produces light in the form of light energywithin the electromagnetic spectrum that lies between visible light and ultraviolet light,
  • the power supplies that generate electric light with efficiency and energy saving technologies such as LED lights, and
  • the so-called spiritual sources that give the faithful spiritual light or divine light.

light properties

The properties of light are constantly studied, especially in physics and in the theory of colors, which answers questions such as: Are black and white colors?

The study of the properties of light were only possible thanks to Newton’s prism, which later created the basis for the study of optics. Isaac Newton (1643-1727) exposes his research on the interaction of light with other matter in his work Optics from 1704.

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Some of the most important properties define that light:

  • propagates in a straight line
  • An incident ray is defined as that which reaches a surface,
  • is defined as a reflected ray bouncing off a reflecting surface,
  • changes direction when refracting from one surface to another,
  • allows the human eye to see shapes and colors.

See also Colour.

On the other hand, there are two types of light reflection depending on the type of surface on which it is reflected:

  • The specular reflection: It happens on smooth surfaces like mirrors where the rays come out in the same direction.
  • The diffuse reflection: Happens on rough surfaces where rays bounce in all directions allowing us to see the contours of an object.

It may interest you:

  • Light refraction.
  • Reflection.

Speed ​​of light

The speed of light in a vacuum is unsurpassed in the Universe, with the fastest measured speed being nearly 300,000 kilometers per second. It is considered in the scientific community as one of the constants of nature.