Linear Magnification of Spherical Mirror

 

Concave Mirror

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For Real Image

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using sign convention

A^lB^l = -h₂ ; AB = +h₁

PB^l = -V, PB = - u

For Virtual Image

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A^lB^l = +h₂ ; AB = h₁

PB^l = +V ; PB = -u

Convex Mirror

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A^lB^l = +h_{2 ;} AB = +h₁

PB^l = +v ; PB = -u

Note:

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If m>1, image is enlarged.

If m <1, image is diminished.

If m is +ve , image is erect and virtual.

If m is -ve, image is inverted and real.

Other formulae for magnification

or