Question

The image of an object placed on the principal axis of a concave mirror at a distance of $25cm$ from its pole, is formed on the object itself. Find out the linear magnification.

• A. $-1$
• B. $1$
• C. $2$
• D. $-2$

Answer 1

The correct option is A $-1$

Distance of the object, u = $-25cm$;
Distance of the image, v = $-25cm$ (Same as object);
We know that magnification, m = $-\frac{v}{u}$
$\Rightarrow -\left(\frac{-25}{-25}\right)$= -1