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The frequency of visible light is 390-700 nm

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The wavelength range of visible light is 400-700 nanometers.

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What can cause damage to the retina? Can the damage be permanent or can it heal?

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

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Too much light can damage the retina in your eye

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Lasers are used in compact disc and dvd players, where the light is reflected from tiny pits in the disc. 

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Lasers are used in compact disc and dvd players, where the light is reflected from tiny pits in the disc. 

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 Lasers are also used in large printers, and in aircraft weapons aimming systems.

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 Lasers are also used in large printers, and in aircraft weapons aimming systems.

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White Light is actually made up of a whole range of colours, mixed together.

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White Light is actually made up of a whole range of colours, mixed together.

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We can see this if we pass white light through a glass prism-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.

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We can see this if we pass white light through a glass prism-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.

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Light Waves can be made by using a laser.

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Light Waves are given off by anything that's hot enough to glow.

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Visible light