Discussion
Assertion (A): Colour differences are commonly calculated under more than one illuminant.
Reason (R): A metameric pair matches under one and fails under another.
Answer: C
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. Where the samples differ spectrally, the illuminant decides whether they integrate to the same tristimulus values. One illuminant therefore tests only one condition, and computing the difference under a second exposes the metameric failure that the first concealed.
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