The numerical aperture of a multi- mode fiber is best described by which of the following definitions?
A. Half the difference between the 50% angles of the far-field distribution
B. Half the difference between the 50% angles of the near-field distribution
C. Half the difference between the 5% angles of the near-field distribution
D. Half the difference between the 5% angles of the far-field distribution
Show Answer
Answer: D
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