Question

magnification of object is +3 what will be the position of image​

Answer 1

Answer:

$If you want more, since m=-3, the image is real and inverted. So, the object must be between the focus and center of curvature.$

Answer 2

Answer:

let the image formed is virtual the M=uv

then v=3u. and let u=d

 applying lens formula f1=3d1−d1

f=−23d now as position of object and lens is changed then direction of travelling of light also changes then both f and u changes their sign.

now again applying lens formula we get 3d2=v1−−d1

then v=3d

and M=uv=3.