Determine the f-number of the lens
A certain telescope consists of a 5.0 inch diameter and an objective lens having focal length 1250 mm.
i) Determine the f-number of the lens?
ii) Determine the magnification of the telescope if employed with a 25 mm eye-piece?
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A certain telescope consists of a 5.0 inch diameter and an objective lens having focal length 1250 mm. i) Determine the f-number of the lens?
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