# Mirror Formula and Magnification

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,*I*= size of image, then**Mirror formula**

# Lateral magnification

When an object is placed perpendicular to the principle axis, then linear magnification is called lateral or transverse magnification.

Always use sign convention while solving the problems.

# Axial magnification

When object lies along the principle axis, then its axial magnification,

If object is small,

# Areal magnification

If a 2D

*-*object is placed with its plane perpendicular to principle axis, then its areal magnification