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Assertion (A): Two samples measuring identically may still look different to a particular observer.
Reason (R): The calculation uses a standard observer rather than the individual concerned.

  • A.A is false but R is true
  • B.Both A and R are true, and R is the correct explanation of A
  • C.Both A and R are true, but R is not the correct explanation of A
  • D.A is true but R is false

Answer: B

Both are true and the reason gives the gap, and observer metamerism is the mechanism. Instrumental and visual assessment therefore complement one another. Neither replaces the other in practice. Instrument and eye answer different questions.

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