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Ultraviolet and infrared wavelengths are invisible to the naked (human) eye.

cw: Yes, in general, you can't see light with higher energy than violet or lower than red. On the low end, that energy level starts with infrared. On the high side, that energy level starts with ultraviolet. Between is the visible light spectrum.

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9y ago
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13y ago

The human eye cannot see in the infrared or the ultraviolet.

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Q: What two lights can't we see?
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