For a spherical mirror if u = Distance of object from pole, v = distance of image from pole, f = Focal length, R = Radius of curvature, O = Size of object , = size of image
Mirror formula: 
Lateral magnification:
When a body is placed perpendicular to the principle axis, then linear magnification is called lateral or transverse magnification.
Axial magnification:
When body lies along the principle axis then its axial magnification
If object is small ; 
Areal magnification:
If a 2D-object is placed with it's plane perpendicular to principle plane. It is called as Areal magnification
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