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Too much light can damage the retina in your eye.

This can happen when you look at something very bright, such as the Sun.

Although the damage can heal, if it's too bad it'll be permanent.

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The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light. A typical human eye will respond to wavelengths from about 390 to 700 nm. In terms of frequency, this corresponds to a band in the vicinity of 430–770 Thz.

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We use light to see things!

As the Sun sends so much light towards our planet, we've evolved to make use of those particular wavelengths in order to sense our environment.We use light to see things!

As the Sun sends so much light towards our planet, we've evolved to make use of those particular wavelengths in order to sense our environment.

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Our eyes can detect only a tiny part of the electromagnetic spectrum, called visible light.This means that there's a great deal happening around us that we're simply not aware of, unless we have instruments to detect it.Light waves are given off by anything that's hot enough to glow.This is how light bulbs work - an electric current heats the lamp filament to around 3,000 degrees, and it glows white-hot.The surface of the Sun is around 5,600 degrees, and it gives off a great deal of light.
White light is actually made up of a whole range of colours, mixed together.

We can see this if we pass white light through a glass prism - the violet light is bent ("refracted") more than the red, because it has a shorter wavelength and is slowed down more by the glass - and we see a rainbow of colours.

This is called 'dispersion', and allows us to work out what stars are made of by looking at the mixture of wavelengths in the light.

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The wave type for visible light is a form of electromagnetic (EM) radiation, as are radio waves, infrared radiation, ultraviolet radiation, X-rays and microwaves. Generally, visible light is defined as the wavelengths that are visible to most human eyes.

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Visible light is electromagnetic waves with a frequency between ultra violet and infrared waves. The only kind of rays that can be seen.