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Black is not actually a colour associated with a unique wavelength of light. Black objects absorb nearly all the light at wavelengths our eyes can detect. When we look at something black we are actually seeing 'no light' (or very little compared to the surroundings).

White light is the exact opposite; white objects hardly absorb any light. When we look at white objects, our eyes take in light at all wavelengths and we interpret this as the 'colour' white.

Visible light wavelength range: 390 to 750 nm (there are 1,000,000 nm in 1 mm)

Any light outside this range cannot be seen by humans and could be called 'black'

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13y ago

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