Discussion
Assertion (A): Purple colours are specified by a complementary rather than a dominant wavelength.
Reason (R): The line from the white point through a purple meets the purple line rather than the locus.
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 mechanism. The purple line joins the two ends of the spectrum locus and corresponds to no single wavelength, since no monochromatic light is purple. A line from the white point through a purple meets that line rather than the locus, so the construction is reversed - extended backwards to the locus, giving a complementary wavelength written with a c or a minus sign.
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