Discussion
If 40 black lines interleaved with 40 white lines can be distinguished across one inch, the resolution is
Answer: A
If 40 black lines interleaved with 40 white lines can be distinguished across one inch, the resolution is 40 line-pairs per inch. A line pair is one black line together with the adjacent white line, so 40 black and 40 white lines make 40 pairs. The answer is (A).
80 line-pairs would need 160 lines, 1600 lines per inch is the square of 40 and has no meaning here, and 40 lines per inch counts only the black lines, but the standard unit of resolution is the line pair.
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