Question

An object is placed at a distance of 12 cm in front of a concave mirror it forms a real image 4 times larger than the object calculate the distance of the image from the mirror

Answer 1

Step 1: Given

Distance to object, $u=-12$ (concave mirror)

Magnification, $m=-4$ (since the image is real)

Step 2: Formula used and calculation

As we know

$m=-v/u$
Therefore,

$-4=-v/(-12)$
$v=-48cm$
Therefore distance of image from mirror is $-48cm$