Discussion
State whether the following is true or false.
A sample smaller than the measuring port gives an erroneously low reading.
Answer: A
Correct answer: True
If the sample does not cover the port, light escapes through the uncovered part and never returns to the detector, so the instrument records less reflected light than the sample actually provides and the reading is low. The effect can be large, and it is systematic rather than random, so repeating the measurement will not reveal it.
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