Discussion
Assertion (A): The chromaticity of an additive mixture lies on a straight line between its components.
Reason (R): Additive mixing is linear in the tristimulus values.
Answer: B
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 tristimulus values of the mixture are the sums of the components’, and chromaticity coordinates are those values normalised - so the mixture is a convex combination of the two points and must lie between them. Linearity is exactly what makes the path straight.
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