Question

An object is gradually moving away from the focal point of a concave mirror along the axis of the mirror. The graphical representation of the magnitude of linear magnification $\left(m\right)$ versus distance of the object from the mirror $\left(x\right)$ is correctly given by
(Graphs are drawn schematically and are not to scale)

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

Using mirror formula, maginification is given by

$m=\frac{f}{x-f}=\frac{-1}{1-\frac{x}{f}}$

$\text{At focus, magnification is}\infty$

And at $x=2f,$ magnification is $1,$




Hence graph $\left(c\right)$ correctly depicts ${}^{\prime }{m}^{\prime }$ verse distance of object ${}^{\prime }{x}^{\prime }$ graph