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What is magnification of a lens ?...

What is magnification of a lens ?

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Magnification of a lens is the ratio of the height of the image formed by lens to the actual height of object.
If h is the height of the object and .h., the height of the image formed by lens, then magnification
`m=(h.)/h`
If u and v are the distances of object and image respectively from the optical centre, then
`m=(h.)/h=v/u`
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