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Question

# A convex mirror has a focal length f. A real object is placed in front of it, at a distance f from the pole. At what distance from the pole the image will be formed :

A
Infinity
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B
f
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C
f2
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D
2f
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Solution

## The correct option is C f2 In case of real object placed in front of convex mirror at a distance f. According to sign convention, Position of object, u=−f Focal length, f=+f Applying mirror formula 1v+1u=1f ⇒1v+1(−f)=1f 1v=2f ∴v=f2 The positive sign of v indicates image is formed behind the mirror.

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