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To focus parallel light rays to the smallest possible spot, should you use a lens with a small f-number or a large f-number?
A _____________f-number is required ___________.
Options:
small
large
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since the spot size decreases with the increasing focal length
otherwise larger spherical aberration appears
otherwise larger chromatic aberration appears
since the spot size is proportional to the focal length and inversely proportional to the diameter
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