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  1. . optical micrometer only works at focus near...

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    optical micrometer only works at focus near objects. at infinity it does nothing.
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    you can guess arc seconds if you know width of crosshair. with a theodolite you can measure arc seconds by...
  2. resolving power think 1/100" ruler or scale. you...

    resolving power think 1/100" ruler or scale. you reach a point where markings so thin hard to see or read.
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    some optical instruments have a 10 arc second crosshair. how I know 1 arc second is...
  3. skinny crosshair 4 arc seconds wide you can...

    skinny crosshair 4 arc seconds wide you can barely see. then they say if you take 100 readings and average you can get 1/10 arc second readings.
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    but in reality if you had a 2 arc second crosshair...
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