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Assertion (A): Illuminant D65 includes an ultraviolet component in its definition.
Reason (R): Real daylight contains ultraviolet, and fluorescent samples respond to it.

  • 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 necessity, and omitting it would misrepresent brightened materials. Instruments must therefore control the ultraviolet content of their source. Brightened samples respond directly to it.

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