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Uses for convex/converging lenses

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    What are the uses for converging lenses when the object is situated at these different distances:

    (where F= Focal length)

    Object is beyond 2F

    Object is at 2F

    Object beyond F and 2F

    Object between F and the lens (one use is magnifying glasses, any others?)

    please note: I know all the types of images formed at each distance just not examples of how the 'distances' or lenses are used in practise

    Thanks for any help
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    Think about the eye

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Updated: March 30, 2012
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