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what can light damage in your body?

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to much light can damage the retina in your eye.

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to much light can damage your retina.

this is what happens when you look at something to bright

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The wavelength of Visible Light is 5*10-7.
The frequency is 10 to the power of 12.

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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.
Lasers are also used in Compact Disc & DVD players, where the light is reflected from the tiny pits in the disc, and the pattern is detected and translated into sound or data.

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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.