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Assertion (A): Colour temperature usage runs opposite to the physical temperature scale.
Reason (R): A hotter blackbody emits a bluer light, yet blue is described as a cool colour.

  • 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 inversion, and the vocabulary is cultural rather than physical. It causes persistent confusion among people meeting it for the first time. Warm means low temperature in this usage.

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