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legali | 15:54 Sun 31st Jan 2010 | Crosswords
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23d Distance from the centre of a lens to the point where is causes parallel light to converge (f-c-l-e-g-h) I think it is focal length but not sure? Thanks in advance.
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Yes, 'Focal length'
15:56 Sun 31st Jan 2010
Yes, 'Focal length'
you are right :)

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