Question

A convex mirror has a focal length $f$. A real object, placed at a distance $f$ in front of it from the pole, produces an image at

• A. $2f$
• B. $\frac{f}{2}$
• C. $f$
• D. $\infty$

Answer 1

The correct option is B $\frac{f}{2}$

Using mirror formula
$\frac{1}{v}+\frac{1}{u}=\frac{1}{f}$
Here $u=-f,f=+f$
$\frac{1}{v}+\frac{1}{(-f)}=\frac{1}{f}$
$\Rightarrow v=\frac{f}{2}$