A concave mirror produces a real image n times the object. Find u in terms of f and n.

Answers (1)

Given, V =nU

Mirror formula, \frac{1}{v}+\frac{1}{u} = \frac{1}{f}

In concave mirror

\frac{1}{-nu}+\frac{1}{-u} = \frac{1}{-f}

\frac{1}{n} +1 = \frac{u}{f}

\Rightarrow u = f\left ( \frac{n+1}{n} \right )

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