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The longest wavelengths visible to the average human being are in the range of ~700 nanometers which appears to be red to the human eye.

However, I am capable of perceiving the red light that my 2 Logitech cordless laser mice emit at 848 nanometers. I hope I am not damaging my eyesight, but I don't believe the emission spectrum for such a laser would be very wide, so I would bet that 800-820 nm is still in the visible range, at least for younger people. I am 22 years old.

the longest wavelengths of visible are red colored

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14y ago

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