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Mirror Equation ...

## Mirror Equation

By Boyang Zhao

The mirror equation is used to describe the image with an object that is at some distance from a mirror (concave or convex):

$\frac{1}{f}=\frac{1}{d_0}+\frac{1}{d_i}$

where
f is the focal length of the mirror
d0 is the distance between the object and the mirror
di is the distance between the image and the mirror

Sign Conventions
f is + for converging mirror (concave)
f is - for diverging mirror (convex)
d0 is + for real object
d0 is - for virtual object
di is + for real image
di is - for virtual image

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Last updated: Thu Aug 31 2006 6:19:30 GMT