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Mirror Formula and Magnification

The expressio...

Question

The expression for the magnification of a spherical mirror in terms of focal length (f) and the distance of object from the mirror(u) is what?

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Solution

Magnification, m = – v/u
Mirror formula is 1/f = 1/v + 1/u

or, 1/v = 1/f – 1/u

or, v = uf / (u -f)

Therefore, m = v/u = f /( u -f)

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