Discussion
Assertion (A): A wavelength scale error affects every measurement the instrument makes.
Reason (R): Reflectance is attributed to the wrong wavelength throughout the spectrum.
Answer: B
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. If the wavelength scale is displaced, every reflectance value is recorded against the wrong wavelength, so the whole curve is shifted and every tristimulus value computed from it is wrong. The error is systematic and appears in every measurement, which is why the wavelength scale is checked with a filter having sharp absorption bands.
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