Write down the magnification formula for a lens in terms of object distance and image distance. How does this magnification formula for a lens differ from the corresponding formula for a mirror?

Magnification formula for a lens is given by:

$m=\frac {v}{u}$

Magnification formula for a mirror is given by:

$m=-\frac {v}{u}$

In both the formulas,

$m$ = Magnififcation

$v$ = Image distance

$u$ = Object distance

The magnification formula for a lens differs from the corresponding formula for a mirror by the negative sign $(-)$.

In the mirror magnification formula, a negative sign $(-)$ is present, whereas, in the lens magnification formula, a negative sign is not present.

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Updated on: 10-Oct-2022

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