Discussion
Assertion (A): Colour constancy is imperfect rather than complete.
Reason (R): A fabric matched under one light frequently fails to match 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 is the evidence. Colour constancy makes objects keep roughly their appearance as the light changes, but it is approximate rather than exact, and metameric pairs expose the limit: two fabrics matching under one illuminant can differ visibly under another. If constancy were complete, no such failure could occur.
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