Which colour of the spectrum has (a) longest wavelength, and (b) shortest wavelength?
(a) The red colour of the spectrum has the longest wavelength.
(b) The violet colour of the spectrum has the shortest wavelength.
Explanation
Red light has the longest wavelength and the least frequency (least deviation), whereas, violet light has the shortest wavelength and the highest frequency (maximum deviation), among all the colours in the visible spectrum.
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