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Laws of Reflection

For a concave...

Question

For a concave mirror of focal length f, image is at distance 2 times of focal length. Find the magnitude of object distance.

A

f

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B

2f

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C

3f

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D

4f

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Solution

The correct option is D 2f
$v = 2 f \Rightarrow R e a l I m a g e$
$2 f = R$ $\Rightarrow$ Image is located at center of curvature, which is possible only when object is also located at $C$
Object distance $= 2 f$

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