The resolving power of the human eye is about 2 two arc


The resolving power of the human eye is about 2' (two arc minutes). How far away would a 1 dollar loony have to be to subtend 2' at your eye? What diameter must a radio telescope have in order to achieve the same resolving power if observing at a wavelength of 21cm?

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Science: The resolving power of the human eye is about 2 two arc
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