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What is the focal length? Where is the object be placed? M is given. Virtue image appears at s’=-250mm?

A magnifier has a magnification of 2.0. What is the focal length of the lens in mm? Where must the object be placed(s) if the virtual image appears at s' =-250 mm?
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Sarai Dooley Jr.

Feb 20, 2025

M = hi / ho = - di / do2 = - di / do = - 250 / do so do =125 mm 1 / f = 1 / di + 1 / do = 1 /(- 250) + 1 / 125 = 1 / 250Focal length = -250 mm... Show More
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