Discussion
Assertion (A): The sphere coating must be spectrally neutral as well as highly reflecting.
Reason (R): A coating with any spectral structure would colour every measurement made.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Light bounces many times inside the sphere before reaching the detector, so any wavelength dependence of the coating is applied repeatedly and amplified. A coating that reflected slightly less in the blue would make every sample read slightly yellow, and no calibration on a white tile would fully remove it.
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