Discussion
Assertion (A): The illuminant used for assessment must be agreed between supplier and customer.
Reason (R): A pair matching under one illuminant may fail badly under another.
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. Where samples differ spectrally, the illuminant decides whether they match, so a batch accepted under the supplier’s lighting can be rejected under the customer’s. Naming the illuminant in the specification is what makes the acceptance test mean the same thing at both ends.
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