Lateral Magnification is defined as
1
The ratio of the height of the image/jpg to the height of the object in a lens or other optical system.
2
The ratio of the height of the object to the height of the image/jpg in a lens or other optical system.
3
The ratio of the height of the image/jpg in mirror to the height of the image/jpg in a lens or other optical system.
4
The ratio of the height of the object in mirror to the height of the object in a lens or other optical system.