Discussion
State whether the following is true or false.
Every colour a person can see corresponds to some single wavelength of light.
Answer: A
Correct answer: False
The spectral colours are only the boundary of what can be seen. The purples and magentas are non-spectral, requiring red and blue together; and every unsaturated colour - pink, brown, olive, grey - is a mixture with no single wavelength of its own. Brown in particular corresponds to no spectral line at all, being a dark orange judged against a brighter surround.
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