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Wavelengths of about 640 nanometres and longer appear red. There is some yellow mixed into this all the way to the limit of vision at about 770nm.

There is also some redness below about 440 nm in the violet region (i.e. mixed with blue).

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12y ago
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6mo ago

The wavelength of red light is typically around 620-750 nanometers, corresponding to frequencies of around 400-484 terahertz.

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Q: What is the wave length of red?
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