Discussion
Assertion (A): Stray light in an instrument matters most when measuring dark samples.
Reason (R): A small absolute error is a large proportion of a very low reflectance.
Answer: C
Both are true and the reason gives the reason, and the lightness function amplifies it further. Black trap measurements are used to characterise stray light. Dark samples are the most demanding case. Stray light and lightness slope compound there.
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