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Assertion (A): Calibration tiles require periodic recalibration.
Reason (R): Handling, cleaning and ageing all change their reflectance slightly.

  • 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 reason, and an uncorrected drift propagates into every measurement. A working tile and a reference tile are often kept separately. Handling and cleaning both alter the reflectance.

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