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700 nanometers  and a frequency range of 430 THz down to 300 THz

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How are infra waves used?

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Infrared waves are used in heat sensitive cams.  These waves are also used in night vision goggles. Used in remote controls as well.www.thenakedscientists.com

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This is how they are made. Infrared waves are just below visible red light in the electromagnetic spectrum. "Infra" means "below"

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There is only one danger for infra red. That is overheating