Question

What is meant by magnification ?
What does it indicate ?
When is the value of magnification negative ?
when is the magnification less than 1?

Answer 1

1) magnification has 2 defination
i) Magnification is the ratio of the image distance to the object distance.
ii) Magnification can be defined as the ratio of the image height to the object  height.
2) it indicate the the size of object
3) it indicate that the image is real 
4) then the image is real