Discussion
Assertion (A): Magenta does not appear anywhere in the rainbow.
Reason (R): It is a non-spectral colour requiring both red and blue wavelengths together.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the cause. A rainbow displays the spectrum, one wavelength at each position, and magenta cannot be produced by any single wavelength - it requires long and short wavelengths together with the middle absent. Magenta is therefore non-spectral, and so are the purples generally, which is why the chromaticity diagram is closed by a straight line rather than a curve.
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