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2 answers

Okay, so the image is four times the size of the object at the focal length. Fine. What's the question?

2007-01-10 02:49:31 · answer #1 · answered by Mawkish 4 · 0 0

Lens = 4 then focal lenth is
100cm/X
100cm/4
25cm
And you use them for reading glasses for example for hipermethropes (long sighted)
Or you can use it to make a telescope of 25cm long

2007-01-10 02:57:51 · answer #2 · answered by runlolarun 4 · 0 0

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