Discussion
Assertion (A): The number of fabric layers must be specified in a measurement procedure.
Reason (R): A translucent sample allows the backing to affect the reading measurably.
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. Light passes through a single layer of most fabrics, so some of what the instrument reads is the backing rather than the sample. Folding to a stated number of layers - usually until adding another changes nothing - makes the reading independent of what lies behind.
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