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Assertion (A): Colour inconstancy and metamerism are distinct properties.
Reason (R): One concerns a single sample and the other a pair of samples.

  • 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 distinction, and both involve a change of illuminant. Confusing them leads to the wrong diagnostic test. Both involve a change of illuminant nonetheless. The subject of the test is what differs.

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