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Q.

Two vertical poles are at a distance of 6.28 m from each other, what should be the maximum distance of an observer from poles to see them separately

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a

21.6 km

b

10.8 km

c

25.2 km

d

15 km 

answer is A.

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Detailed Solution

θ=dr

r=df

For eye limit of resolution is 1min of arc

r=6.283×104=21.6km

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Two vertical poles are at a distance of 6.28 m from each other, what should be the maximum distance of an observer from poles to see them separately