Magnification produced by a spherical mirror is given by the relation,
`m=("Height of the Image")/("Height of the Object")= -("Image Distance")/("Object Distance")`
`m=(h_(1))/(h_(0))= -u/v`
Let the height of the object, `h_(0)` = h
Then, height of the image, `h_(1)` = −3h (Image formed is real)
`(-3h)/(h)=(-v)/u`
v/u=3`
Object distance, u = −10 cm
v = 3 × (−10) = −30 cm
Here, the negative sign indicates that an inverted image is formed at a distance of 30 cm in front of the given concave mirror.
