Discussion
Assertion (A): Both a colour difference and a metamerism index are usually specified.
Reason (R): The two answer different questions about the same pair of samples.
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 colour difference asks how well the pair matches under the reference; the index asks how much that match will deteriorate under another illuminant. A pair can score well on either alone, so a specification that names only one of them can be satisfied by a batch that fails in use.
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