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A concave mirror of focal length produces an images n  times the size of the object. If the image is real then What is the distance of the object from the mirror?

  1. left parenthesis straight n plus 1 right parenthesis straight f
  2. open square brackets fraction numerator n minus 1 over denominator n end fraction close square brackets f
  3. left parenthesis n minus 1 right parenthesis f
  4. open square brackets fraction numerator n plus 1 over denominator n end fraction close square brackets f

The correct answer is: open square brackets fraction numerator n plus 1 over denominator n end fraction close square brackets f

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