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Assertion (A): A tristimulus colorimeter handles metameric samples poorly.
Reason (R): Its filters only approximate the true colour matching functions.

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

Answer: D

Both are true and the reason gives the limitation, and the error depends on the sample spectrum. Spectral instruments avoid the problem entirely. The filters only approximate the true functions. Exact agreement would require the Luther condition.

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